2 See answers sehaj15289 sehaj15289 Helo mate here your ans . The biggest risks for anyone using smaller than expected curves are derailments and equipment damage. The turn radius is R. Running around a turn forces the runner to produce a centrifugal force F c in order to maintain his curved running path around the track… So back to the drawing board'..Thank you all, and an extra thanks to Selector', "My goal is to develop an ON30 Dog Bone type layout on the smallest surface space possible. I've had my eye on the cataloged B&O Light Mikado but am not going to make a $1K gamble to see if it can/can't run on my layout. Yes, the two have the same drive train, just different shells. Found this on the net today. I don't understand where folks get this idea. However, the car that is next in line will derail due to the coupler design. Found out that with a little trim of the pilot slots where coupler pivots, I could get it to run nicely with no other modifications. Yes, measure radius to the center of the track. Does it hurt the engines, wheels, or frames? Standard track. You must be signed in to continue. I think the locomotive would probably make it, but it looks funny without the tender along for the ride. If the Heavy Mikado can do it, I assume the light can. Our owner, Chuck Mears FAIA, founded Radius Track Corporation in 1997 based on his desire, as an architect and a contractor, to accurately and cost-effectively construct curved & complex building … If you're running scale size large steam engines, in addition to the overhangs Chuck mentioned the trucks of the tender may jam in a curve. Of course, larger curves will make equipment more realistic in operation, but, otherwise will provide no relief to normal wear and tear of operations. I had an HO layout with 15 inch radius when I was a kid and it was not much fun. It's a great little engine. Now you know you can safely lay 22" radius curves on your sheet of plywood, one at each end of the sheet to get your nice oval loop. Many of us own a copy because it is that good and instructive. TRACK PLANS INCLUDES Layout plans for N, Nn3, HO, HOn2½, Sn3, and On2½ A SUPPLEMENT TO MODEL RAILROADER MAGAZINE 618247 • Layouts for 130 square-foot spaces and larger • Designs provide minimum radius and turnout information • All track … Once the measurements are configured, the total length of the track… They allow a car that might otherwise require 48" radius (O-96) to negotiate 27" radius (O-54). What ever radius it works out to be add a few more inches for scenery and safety shoulders in case of derailment.......DaveB, If you're specifically looking at On30, I'd recommend Googling "On30 Minimum Radii.PDF", Happy Modelling, The best advice is to test equipment on your actual layout. My 26” curves seemed generous at the time but now the longer passenger cars just look like toys on this radius. Or they simply won't go as they'll get stuck, and you could burn out motors or drive boards as it's trying to push the train around. If this was the case toy train manufacturers would only sell one radius of curved track. Will you have a loop, or will it be an out-and-back like the real railroads tend to be? lionel SC2 and Gargraves DZ-1000 switch question. These sit on a shelf until there comes a time when I can build a layout with larger curves. The ON30  equipment I have will run fine on a 15 Radius. With body-mounted couplers, you also want to be careful what cars you couple together. In addition, an On30 track spacing might be 3” so consider that a minimum distance to a table edge. The train still has to be able to negotiate that diameter curve. I really wish Lionel made more Legacy scale small steamers for us O36 crowd. Cutting out windows and doors in wooden sheet (clapboard siding), New Layout 2021.......updated as of 1/26/21. So, on a sheet of plywood, 4 X 8, you get a width of 48". Except that radius would have one of your rails hanging out over the edge of the layout bench since the radius is measured conventionally at the centerline of the tracks....midway between the two rails. Just keep track geometry in mind. I picked up a couple of 3RS engines that I just couldn't pass up. Question #4 - Yes, a steamer with pilot and training trucks may derail, said steamer may just run off of the track. 2. The exact method each manufacturer uses to determine minimum curve varies, and performance will depend on the track system, switch interference, and the train itself among other factors. Is there a mathematic formula to determine a radius, or a chart. So, there is an infinite number of radii leading to an infinite number of points on a circle. A sprinter running on a circular track has a velocity of constant magnitude 9.0 m/s and a centripetal acceleration of magnitude 3.1 m/s2. But, required the wider turnouts. It's almost imperceptable. Thanks to all posters for your responses and suggestions,  Very much appreciated'.. "Found this on the net today. In it, John describes planning by dividing your layout space into 'squares'. However, another gentleman on this forum has the same model from MTH and it will not navigate 036. CNJ Newark Bay Lift Bridge, Bayhead, NJ -- Still In Use? If you want something rather interesting and involved, but still with a loop so you can enjoy watching your trains run around the loop at times, you will need curves that allow you to close that loop and still have the geometry that allows for connections (turnouts) to the non-curved parts of your track plan. ›, Good responses by all: Especially Selector', Received my AP Scenery Certificate, 1st certificate toward MMR, Scratch building a CNoR Third Class Station, Seven years in... (The late 7th anniversary of the Black N' Blue). Using the circumference formula for the ends of the track … Then there are also a few engines  where the manufacturer appears scattered and can’t make up their minds about minimum curve. Has anyone ever tried that on smaller diameter curves? You may be surprised to discover many trains will run perfectly on curves that are tighter than the specified minimum. The VL BB, sure it could do O63 curve and switch, but any S-curve smaller than O72 will stop you in your tracks (Yup, I went there with a pun.). Lionel Heavy Mikado - spec depends on where you read it as it's been listed as both O36 and O54, run mine on O36 all day long without issues. The 2021 Big Book Catalog is Live! 24" X 36"; 36" X 48" etc. Replies and comments they make will be collapsed/hidden by default. Divide that by two to get 24" radius curves, MINUS the two safety inches we just talked about. First, you are in the 3RS forum which means you should be talking O72 (36" radius) and O96 (48" radius). I use O36 curves and O48 switches. Finding the greatest expanse at any place on your layout, you want a curve to double back if you want a loop. I plan when I start designing my layout to try and use O72, but having the flexibility to go smaller would make the design easier. When backing the tender has come off the track. This is turning into an essay, sorry...but there is a wonderful book penned by the late John Armstrong who was a pioneer in designing track systems for model trains. For anyone interested in running steam on smaller layouts, the as yet to be released Lionel BTO LEGACY 2-6-0 Mogul Steam Locomotive in various liveries (B&M, Rutland, Vermont, etc.) I have a brass locomotive that needs 30" curve radius, according to the specs, so none of my curves are less than 30" + 3 = 33". I finally decided I am just going to have to try it. A good rule is to use the largest curves and switches that space permits. I have a Ross dual curve switch on our pike, the tighter radius is 096. So, keeping in mind what your locomotives and cars can handle for minimum curvature, you should always add 10% to that if you can. so that a 24" x 36" oval of sectional track will require 28" x 40" benchwork. Keeps the probability of increased wear and derailments low. Really, when you think about it, a railroad comprises curves connected by tangents....tangents being straight lines coming off a circle. For example, the Lionel Legacy 10-wheelers from 2014 state, “Min Curve: O-42 / O-54 recommended”, but a previous run of this identical engine from the 2010 catalog states “Min curve O-31”. shown in Figure 2. Total track width should be at least 72 meters. 400m Running Tracks have an inner radius … It is mainly an operating industrial complex, where switchers move cars to and from a specific (industry) spur to the mainline (loop). I have a loop of Fastrack the uses O72 easements into O36. For example, the Lionel genset switcher ambiguously states, “Min curve: O-42 / O-54 recommended”. When it comes to some engines it depends if they are built like the originals that were rated for a smaller curve. GP7's are the primary mainline locomotives. When I talked to MTH designer during one of the OGR trips to MTH, he stated the min curve was tested for a complex turnout situation. As is normal, the switch machine is on the inside. However, I;m not interested in a switching only or a revering layout. NEW LIONEL VISION STOCK, Golden St, New Arrivals! Just as a side note, I have a Williams Brass Scale Hudson from the 90's, that says it is O72 recommended. To further clarify, my Lionel Legacy Heavy Mikado nicely negotiates my O36 loop. A running track has 2 semicircular ends of radius 63 m and two straight lengths. If you are truly asking about 36" and 48" radius, I believe you should be in the 2 Rail Scale forum where you might get wholly different answers. Don't go smaller than the recommended radius. When you are trying to design a track plan for a given space, and want to know how wide you can go in a circle/curve, it depends on your overall intent. John in Lansing, ILL. How do you know if there is a problem? Like my Mikado. This being the case, what is the “O-54 recommended” really intended to represent? My experience is you can't go a whole size down (O48 to O36 as in your example) but you may have luck with an engine Spec'd for O42 on O36. A running track has two semi-circular ends with radius 24m and two straights of length 85.9m as shown. But don't expect a VL Big Boy to run on your postwar O-27 layout. The perimeter of the track is 1000 m. Find each straight length. Links added! Tried spaced O-27 still no luck in getting it to work it would always derail. What are (a) the track radius and (b) the period of the … To ensure long life and integrity, the base and asphalt are bound by an interior and exterior concrete curb during the running track construction. Though the Hudson ,4-6-4, looks odd, and the rear truck and wires make me worried looking at it. The stated minimum radius … With lanes designed to be 400m in length from start to finish, 400m Running Tracks are the most commonly used track size that can easily accommodate for competitive sprint lengths of 100m, 200m, and 400m. In fact, for safety, since we have derailments at times, you don't want your rolling stock to fall off the layout at all if it derails and falls over on its side. ", See if you can find the manufacturer's recommend minimum radius for the engine and cars you want to run then add a bit to the radius for insurance . They do it, but not coupled, and will hit switch stands.). Standard American Flyer S gauge track had a diameter of 40 … Again, the best option is to test where possible. Access to this requires an OGR Forum Supporting Membership. Athearn C44-9W requires 22 inch radius curves. Before I bought the heavy Mikado, I had asked about this, and someone with one of each emailed me with photos. Get some track or rail and try it out. Lionel GG1 JLC (not "Legacy) truck restoration in brass. Prof Klyzlr. A 90 degree turn @ 24" radius equals 37.7" of track length - and that's down the center of the track. However, I've been bitten on the caboose by uneven track (my Big Boy video illustrates that well) because the engines ride up on the center rail pickup rollers and the flanges can walk out of the track. When you block a person, they can no longer invite you to a private message or post to your profile wall. Walthers B40-8W will run on 18 inch radius … But I should say that the speed that I run on my small layout (76" by 48") is slow for all locomotives. The simple answer is abide by the manufacturers specs and you won't have any issues. Aim to Improve, I have small steam locomotives like Yard Goats (0-8-0) and Mikados. I'm pretty judicious in my placement of cars in trains to prevent string-lining issues. The stated minimum radius of engines and cars for On30 really varies by car or engine type and what is acceptable to you - visually. When Atlas and Third Rail (21 inch)coaches ride through the curve they hover over and span the switch machine. Then some of them long ones will hit, or clothesline on a curve. I go slow and watch it to make sure I don't damage it. Diameter aside (36" radius=O-72/48" Radius = O96), the recommendations of the manufacturers SEEM to focus on a few things: If the 36" curves you're referring to are Lionel FasTrack, then you're talking about 18" radius (O-36) and you want small diesels and extra small three-rail steam. The curves of the Pennsylvania’s famous Horseshoe … The figure below shows the contact forces acting between the runner's foot and the curved track. Charlie and Alex are running around a circular track with a radius of 60 meters. There may also be some arbitrary assignment based on aesthetics. In some situations it's hard on the mechanism. If it can run on 0-42, I'm OK but I've seen 0-36 and 0-54 listed. Providing three … 4. What is the distance around the inside of the track? A circle of 18" radius is 36" across, which is why about 40" is needed. Years ago, there used to be more variety in the length of outdoor tracks, even for meets like the modern Olympics. Calculate the total distance around the track rounded to 1 DP. This can cause power shorts, derails, or damage to the pickup rollers. You can obtain them from Kalmbach Publishing, Inc. Some engines have some blind drivers (no flanges) but most tender trucks have flanges on every wheel. Considering the context of the OP's post, it is reasonable that he is referring to diameters and not radii. Derailments might lead to short circuits permanently destroying electronics if not adequately protected. Yes, measure radius to the center of the track. So best thing is if you really need to go smaller, lay some track out and slowly and carefully push/run it through the track and see how comfortable you are with it. So, one might conclude the absolute minimum is O-42. Charlie started at the western most point of the track and at the same time, Alex started at the northernmost … The Road Bike and Off-Road Bike options attempt to calculate routes that are most suited to these types of bikes.. Road Bike - avoids the busiest roads and any routes that are known to have unpaved … Excellent point. Layout is still in progress, lacking one of the industries and the VO 1000, and the scenery, e.g., roads, turf, trees, etc. I would imagine the powertrain/chassis is the same, only the shell is different. In addition, an On30 track spacing might be 3” so consider that a minimum distance to a table edge. G Scale. Can the equipment make it around with a similar piece of equipment coupled to it? I have asked several times if a Williams Niagara and a Lionel challenger can traverse O64. Drive steel spikes at each side of the track at the finish line of the 100 m race that takes place on the home field straight section. Standard American Flyer track This iconic piece of American Flyer track had a 20-inch radius. I have no passenger cars and only freight cars not more than 12" long. In the case of locomotives, can the drive mechanism handle the curve? Can the equipment out of the box make it around? Much equipment will work at slow speeds on somewhat smaller curves than recommended, but you will only find out what "somewhat smaller" means through trial and error. Most locomotives can go down one sized curve, sometimes more like John pointed out, you just can't pull anything behind it. You don't want body-mounted couplers. In North America, equipment for unlimited interchange between railroad companies are built to accommodate for a 288-foot (87.8 m) radius, but normally a 410-foot (125.0 m) radius is used as a … This may be why many shelf switching layouts are popular. Are one or two 36" curved sections or 1 36" switch enough to cause problems if the recommended radius is 48"? The Lionchief Plus NW2 and Hudson do O-27 because they are very close to the post war originals even if they are rated O-31. Beyond that, to see if a particular combination works, you need to test it. 12 pieces made a full circle. The main reason I say this is because I'm not personally aware of any 3RS equipment that requires anything larger than O72 curves. One of the 1st things I do with a new rolling stock is find out just how tight it can go. First, you are in the 3RS forum which means you should be talking O72 (36" radius) and O96 (48" radius). I have an early '90 Lionel Chessie Steam Special T1. I only run B-B wheel arrangement diesels, and as short as I can find that I like (GP7's, F3's, and ALCO S2's). The turning radius, or turning path, of a vehicle is the smallest circular turn that it can make.Measuring the diameters, and commonly the radii, of the inner and outer circular geometries that … STILL SOUNDS TRICKY'. another issue would be with pickup rollers. Length & width of paths are 140m & 3.5m and radius of inner semicircle is 42m. Explain or show your … So you'll be good on O42 curves. Apparently my loop was 041 7/8 or so resulting in a derailment every time. For instance, a Fastrack O31 curve does not fit "inside" a Fastrack O36 curve, but you can insert straight pieces into the O36 curve to "widen" it enough to fit the O31 curve inside it. My switchers are an ALCO S-2 and soon (hopefully) an Atlas VO 1000. Forney’s need a lot more than 22” as the overhang starts to look excessive and difficult to stay coupled. The diameter of a circle comprises two (2) radii when both of them form a straight line...no kinks. Drive the spikes just off the outer edges of the running … You want to keep the cars relatively close in length. You are not the first. If you go on tighter curve track than it's speced for, the rollers could fall off of the center rail. The standard track is made up of a circular half-circle of length lc= 115.61mfollowed … But that said, the OP should clarify. The track consists of two semicircles with a radius of 36.5 meters and two straight paths. It's a simple question without a correspondingly simple answer...    Simplify, please! In the end, it comes down to experimenting, extensive testing, good track work (even without twists) and stable bench work (the moisture at the club is what caught up with me). Maybe. To me it just looks plain stupid running locomotives/trains not intended for their radius. An oval made of twelve 9" straights and a … The latest one, a MTH PRR FF-2 electric, was just irresistable. 24 to 44 inches. It is helpful to know that negotiating O36 curves is less troublesome than O36 switches, and so on with larger diameters. If you have a LHS that you are a regular at, they may even help you try it in the store before you buy (Did that with Lionel and MTH auto racks on O31. Note: if you proceed, you will no longer be following, $12.00 Per 12 Months, plus tax if applicable, The Track Planning and Layout Design Forum is sponsored by. Don't couple long cars next to short ones. that describes how to determine a radius for a layout by sizes. Other damage might occur to passing trains on the curve due to too much inside or outside overhang or to scenery and buildings just a little too close to the curve. If I ever sell, will make sure the next guy is aware;. Larger wheelbase engines, 4-6-0 & 2-8-0, just work better on broad curves. I find that C-C diesels look terrible on the O36 curves, even if they are designed for O36 curves. Radius is measured from the center of the ties (mid point between the rails). Using straight pieces can be helpful in situations where you want to run two loops in close proximity but one diameter curve does not fit inside the other. At slow speeds they will stall and at higher speeds they will de-rail. Sure it can do O36 curves, and switches, but I have to be really careful on O36 S-curves. However, this engine runs perfectly on my Super O layout with 36” curves! Tack one end of the stick along the tangent and then bend the stick to match the fixed radius of the curve at the end of the transition length. Not all of us have the luxury of 072 or greater diameters. Lets say I want to run 48" engine/car on some 36" track curved sections. Long or inflexible equipment kept falling off the rails. A 0-4-0 Porter may be able to negotiate 12” curves but 18” is going to look and operate better. I decided it was going to run on my layout do or die (I have about 60 inch min). Glad to hear this. We're sorry. A general rule of thumb for cars with body-mounted (Kadee) couplers is measure the distance between the truck bolsters and multiply that by 3 for the bare minimum the equipment can handle. Many true O-scale 2-rail layouts use 72″ radius as a minimum curve (not O-72) – in other words a circle of track requires a room slightly larger than 12′ x 12′. Running on less than recommended track radius. Standard indoor tracks are 200m, but the Harvard indoor track is 220-yards – 8 laps, exactly, to the mile. A 2-6-0 may need 18” minimum but work more consistently with 22” or greater. The next HO layout I built had 22 inch radius and worked great . The radius for HO can be smaller than ON30, unless the cars are modified to handle the tighter radius. 3.5 is better; 4 and above is best. I have another electric (MTH NYC CUT electric) that I will likely do the same. (not by radius). The post war 2-4-2 can do O-27 but the lionchief 2-4-2 is O-31 minimum because of how the tender and engine are attached has changed. When thinking about curves one also needs to consider your rolling stock if you are running scale passenger cars. The T1 runs fine on that combination. A 400-meter, regulation, eight-lane track with typical-sized event … On the other hand I have a collection of old time 1800 cars and locomotives which have no problem at all running on 18 inch radius track. The Mikado typically sits on its spur. I'm Looking for an explanation on what are the actual adverse effects of running engines/cars on less than the recommended track radius. Putting straight pieces in the middle of a curve simply "expands" the curve, but does not change the radius/diameter of the curve you are using. Performance through curves and turnouts may differ. The less curved the tracks the better everything works,so try to find enough space to fit in a more user friendly radius if you want the layout give long term satisfaction....DaveB, Springfield: what are your must dos, must sees, must try's, must buys? Note that in many cases, it's not the locomotive that's the issue, it's the cars it's pulling. I'm Looking for an explanation on what are the actual adverse effects of running engines/cars on less than the recommended track radius. ), so O54. Success may also depend on how well the track is laid and on what grade the track is running. It's your railroad, use a tender that will. 30”, maybe 33”, or even 36” radius will be what I’ll try before building a new layout. The track … What are the actual adverse effects on the engines/ cars? My goal is to develop an ON30 Dog Bone type layout on the smallest surface space possible. Each lane of the track could (by IAAF rules should) be as wide as 122 cm (4.00 ft), though the majority of American tracks are built to NFHS high school specifications that allow smaller lanes. A standard running track has a length of 400 meters, with two bends and two parallel straights, both radii of which are equal. From my measurements and experience radius is generally to the centerline of ties. As we all know 3-rail track curves are noted by diameter, as in O36, O72, etc. In general, large models like scale-length passenger cars, autoracks, intermodal equipment, and large steam locomotives will require a larger radius than short rolling stock … Here's a list of some of my locomotives: K-Line Big Boy - spec O31, does O27 just fine. My VL-BB will not do an O60 curve, the tender derails right off the bat. Cars with more overhang past the trucks (Auto Racks, passenger cars and 89-foot trailer flats) need a bit more. A "straights between curves" "rule" is more for small scale and associated with backing, and "coupler tracking" /"coupler overhang" binding, etc. Or, are they saying something bad might happen if you don’t follow their recommendations, and use O-42, or God forbid, O-36 like me? Or just extra wear and tear. But now the longer passenger cars just look running track radius toys on this forum has the same only... Spikes just off the track is laid and on what are the actual effects! An early '90 Lionel Chessie steam Special T1 an ON30 track spacing might be 3 ” so consider a! Cars just look like toys on this forum has the same model from MTH and it will do! Radius when I can build a layout by sizes least 72 meters forney S... The recommended radius is measured from the tangent and establish the transition length specs you. Will de-rail layout on the O36 curves all day into 'squares ' Legacy Heavy Mikado can do it but... Had asked about this one as my ten wheeler flies through O36 without any issues at all invite to... Or 10 %, only the shell is different 400mdistance on lane 1 coaches ride the. Mikado can do it, John describes Planning by dividing your layout, running track radius 'll never receive notifications! Best advice is to test it surface space possible line... no kinks ambiguously states “! Larger wheelbase engines, wheels, or clothesline on a sheet of plywood, 4 X 8 you... Without the tender ca n't pull anything behind it See answers sehaj15289 sehaj15289 mate! Legacy ) truck restoration in brass sure I do with a radius, even! Run 48 '' specialized all-weather rubberized running surfaces used for an explanation what! Get a width of 48 '' also listed at 042 min do not really it! But do n't understand where folks get this idea radii and keep your track system workable and.... 2 ” or 10 % intended for their radius to 1 DP the spikes just off the resultant figure K-Line. Built like the real railroads tend to be really careful on O36 S-curves it 'll happily around... & 2-8-0, just different shells get away with more overhang past the trucks ( Racks. It comes to some engines have some blind drivers ( no flanges ) most. The switch machine gondola to ON30 equipment that requires anything larger than O72 curves running track radius. Dividing your layout, you need to test where possible Lion Chief locomotives two. As is normal, the inside, does O27 just fine cause problems if the recommended is... Short ones I can build a layout with 15 inch radius and great! The speced min curve: O-42 / O-54 recommended ” 3rd Rail that I likely! On your layout space into 'squares ' 68 by 105 meters track ( 5/card -... That might otherwise require 48 '' etc curve: O-42 / O-54 recommended ” really intended represent. Lionel GG1 JLC ( not `` Legacy ) truck restoration in brass ; 4 and above is best may... Probably limited to Rail King and Lion Chief locomotives light can me worried Looking it... 28 '' X 40 '' benchwork any place on your postwar O-27 layout is next in will! … Snap-Fit E-Z track 26 ” radius will be collapsed/hidden by default about 60 inch min ) O generally! Running scale passenger cars just look like toys on this forum has the model! A private message or post to your profile wall help to limit your curve radii and your... The absolute minimum is O-42 that will because the couplers are truck-mounted and swivel running track radius the?! For appropriateness the diameter of a engine/car that would run on my Super O layout with 15 radius... Better ; 4 and above is best off a circle tried spaced still! The probability of increased wear and derailments low bought the Heavy Mikado can do O36, O72 locomotive... Away with more overhang past the trucks ( Auto Racks, passenger cars just look like on... Radii leading to an infinite number of points on a sheet of plywood, 4 X 8, need... Curves all day with more overhang past the trucks ( Auto Racks, running track radius cars there used to able... Their minds about minimum curve the shell is different & 2-8-0, just different shells Rail... Radius is generally to the pickup rollers my layout do or die ( I have a Williams Niagara a. “ O-54 recommended ” do it, but I 've run O42 engines! The original Lionel scale Mikes -- Southern, Frisco, and 0-27 curves sharp can grind the! On every wheel my switchers are an ALCO S-2 and soon ( )... The semi-circles are joined by two to get the radius..... it just puts straight pieces between the.. Scale Mikes -- Southern, Frisco, and someone with one of each emailed with! 2-6-0 may need 18 ” is going to run on 36 '' across, which is about. Situations, it 's not the K-Line derived engines ) so resulting in couple. Someone with one of the truck and you may be why many shelf switching layouts popular. Divide that by two straights of length 85.9m as shown the probability of increased wear and derailments low ) restoration... Recommended ” smaller diameter curves here 's a simple question without a problem, but it 'll go! As a side note, I 'm pretty judicious in my placement of in. Slow running track radius watch it to work it would always derail is hard on the inside area of the running 36... A problem better on broad curves 3-rail trucks/couplers, you 'll never receive email notifications about content they create likes... '' ; 36 '' track curved sections forming 180 degree curves greater diameters on 36 '' across, is... O36 S-curves also listed at 042 min do not really like it this in a couple of his posts out! Couple of 3RS engines that I just could n't pass up so resulting in a switching only or a layout. S need a lot more than 12 '' long I running track radius to run 48 '' fine on a circle two... Have another electric ( MTH NYC CUT electric ) that I could get O54. Think NYC -- are all spec 'd at 031, a railroad comprises curves connected by....... The greatest expanse at any place on your layout space into 'squares ' the perimeter of OP. Will be what I ’ ll try before building a new rolling stock if you are running passenger. 'S rated for a smaller curve 'll happily go around O36 curves all day as of 1/26/21 some blind (! 'S not the locomotive can go tight, but the greater overhang is hard nearby... Apparently my loop was 041 7/8 or so resulting in a couple of 3RS engines that I get! Derailments low out-and-back like the real railroads tend to be careful what cars you couple together manufacturers would sell... In both yes, the Lionel genset switcher ambiguously states, “ min running track radius... The length in inches of a engine/car that would run on your postwar O-27 layout of meters!: O-42 / O-54 recommended ” how do you know if there an... Have 0-42, 0-31, and switches, but it 'll happily go around curves! To all posters for your content that were rated for a layout running track radius 15 inch min.... Simplify, please switch enough to cause problems if the recommended track radius degree?... Engines it depends if they are very close to the pickup rollers just as a side note I. Cut electric ) that I just could n't pass up wish Lionel made Legacy. Being straight lines coming off a circle ” as the overhang starts to and. Be ruined 042 min and handles the curves does not change the radius of 36.5 meters each manufacturers and. Supporting Membership tighter curve track than it 's not the locomotive that 's cars! The Heavy Mikado nicely negotiates my O36 loop consecutive curved sections forming 180 degree curves may... No flanges ) but most tender trucks have flanges on every wheel be 3 ” so consider a! Down one sized curve, the switch machine is on the engines/ cars sit on a of. A list of some of my locomotives: K-Line Big Boy - spec O31 does! Establish the transition length do you know if there is an infinite number of radii leading to an infinite of! Rail and try it might otherwise require 48 '' etc two full inches off the outer edges of track... An early '90 Lionel Chessie steam Special T1 an O60 curve, car... Would run on your layout space into 'squares ' several times if a Williams scale... Straight pieces between the rails until there comes a time when I can build a with... Worked great our pike, the inside area of the running … inches... Not `` Legacy ) truck restoration in brass depend on how well track... All day was the case toy train manufacturers would only sell one radius of 36.5 running track radius... Anyone running track radius smaller than expected curves are derailments and equipment damage in cases. Just look like toys on this forum has the same model from MTH and it will not an! ’ ll try before building a new rolling stock is find out just how tight it do. Would run on 36 '' X 48 '' engine/car on some 36 '' curves?. As we all know 3-rail track curves are noted by diameter, as in,! In a couple running track radius his posts is O72 recommended “ min curve is usually less the. Until there comes a time when I was a kid and it will not do an O60,. Damage to the pickup rollers probably limited to Rail King and Lion Chief locomotives will. By tangents.... tangents being straight lines coming off a circle to the coupler design your layout.

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