How Non-Derailing Turnouts Work

One of the advantages of trains that use a three-rail track system is the ability to use the third rail in clever electrical circuits. Under normal circumstances the center rail is used as the "hot" power of the electric train circuit while both outer rails serve as the "common" side of the circuit. However, when one of the outside rails is electrically isolated from the other it may be used as an electrical switch when the metal wheels of locomotives and cars complete an electrical connection to the isolated rail. A common use of this feature is the non-derailing turnout.

Finding Common Ground

A Lionel service diagram showing the internal wiring of
a #1122-E turnout.

Since the introduction of the #1122 turnout in 1952, all Lionel O27 remote turnouts have been pre-wired for non-derailing operation, and it was a feature in Lionel's Standard O turnouts long before then. The wiring schematic as seen to the left is still the standard in today's Lionel remote turnouts. The two outside rails serve as the common "ground" of the track circuit. The inside rails however are electrically isolated by the frog on one end and by an insulated fibre track pin on the other. 

When the metal wheels of a car or locomotive complete the circuit from the outside rail to the insulated inside rail the turnout throws in the direction of the train to avoid a possible derailment. This operation works only for trailing point maneuvers [from diverging route to single route]. Since these turnouts are wired to receive power directly from the track this operation occurs even when no turnout controller is present. One should be certain that a train does not sit for long periods of time on these activation rails as continuous use may burn out the switch motor.

Other Uses

In addition to the safety of avoiding unnecessary derailments, the electrical properties of non-derailing turnouts can be used for other purposes as well. In the example on the left two turnouts are wired together so that they throw simultaneously either with a switch controller or by train activation by connecting the electrical posts controlling switch motor movement to one another. 

If connected together identically, throwing one turnout will result in identical motion from the other turnout. In this scenario one can select either Track A or Track B by simply throwing one turnout and the other will snap to a safe exit automatically.

For a bit more excitement the turnouts can be connected opposite one another so that when one turnout throws straight the other goes to curve. Looking at the diagram above, a train traveling from the top of the track layout reaches a curved turnout at the right side of Track A. Initially the passing of the train activates the opposite switch to throw straight for Track B. However the arrival of the train at the left turnout throws it safely back to the train on Track A and simultaneously throws the right switch to straight toward Track B. After completing the loop the train now finds the right turnout thrown towards Track B and its exit on the left side returns the right turnout to Track A for the next loop. In this way the train continuously and automatically switches between the two options on each loop.

Once this concept is understood it may be used for a variety of purposed in various track designs. The uses are limited only by your imagination! Layout visitors will be astonished at how the train automatically changes routes with no operator input. 

Happy Railroading!

Tubular Track and Lockon Basics for Beginners

Here is a video made by Lionel's Customer Service department that can be viewed on Lionel.com. These tips apply to all makes of tubular track, not just Lionel. While O27 track is shown in the video, the same principles apply to regular O31 profile track as well.

O27 Tubular Turnout Roundup

If, like me, you choose to use O27 profile tubular track for your model railroad there are several styles of turnouts (switches) available. While none of these is currently in production, most are easy to find at train shows, online auctions and hobby shops that deal in used and collectible trains. Some feature automatic non-derailing or lighted switch-position indicators. Some run on transformer power while others utilize track power. Some are compatible with nearly all eras and manufacturers while others are strictly for post-WWII Lionel-style locomotives. Below is a short roundup of turnouts you are likely to find for your tubular track layout.

Note: According to sources at Lionel, the company has not permanently discontinued production of tubular track. The company feels, however, that the current supply of tubular track is sufficient to meet demand and they have therefore ceased production of new stock until inventory levels require new production. Lionel intends to resume production of tubular track as needed at a later date.

Lionel

Pictured at left is a typical Lionel manual turnout from the 1970's. The basic design of this turnout was the same from the beginning of the Postwar era to current production. The main differences from one model to another is the mechanism housing (upper left in the photo). If this was a remote turnout the switch motor housing would occupy the smooth area seen at the top of this photo.

Most Postwar remote turnouts have lighted position indicators, either a rotating lantern-type (such as the #1122 and 1122-E) or red and green lights on the switch motor housing (such as #1121). MPC-era turnouts feature a position indicator that is designed to look like a dwarf signal, but it is unlighted. Also, most Postwar turnouts came with lighted position indicators on the switch controllers as well. Some MPC turnouts have this feature as well but others had this feature removed as a cost-saving action.

Lionel's remote O27 turnouts are designed to run on track power. This makes wiring easier, but the turnouts may not throw completely if the train is running at slower speeds and lower power. They may be modified to operate on transformer power if desired but this requires disassembling and rewiring the turnout. The nicest feature on Lionel's remote O27 turnouts is the anti-derailing feature that is pre-wired into the switch (except Postwar #1121) that helps prevent a train from running through a turnout that is thrown against it.

Locomotives and rolling stock generally run smoothly through these turnouts unless the locomotives are of the "fat wheel" design often used by Marx and in many Prewar Lionel (pre-1942) locomotives. These types will not run though them whatsoever (See The 5-Minute Marx Switch Fix for more info). Train cars do have a tendency to derail on these turnouts when a train is backing, especially when the train is long or when traveling at higher speeds.

These turnouts and their Postwar cousins are very easy to find and the remote versions can generally be found in good condition for $15 or less. Expect to pay a bit more for those with lights, original boxes or if they have their original controllers. Manual versions can generally be obtained for as little as $5. Lionel also made an O42 version of these turnouts, but these can be difficult to find.

Overall, Lionel's O27 turnouts are an excellent choice for tubular track layouts unless you wish to operate certain Marx or Prewar locomotives on your layout.

K-Line

A K-Line O27 remote turnout

K-Line turnouts include many premium features usually associated with O gauge profile turnouts such as lighted switch position indicators, pre-wired anti-derailing, and the choice of transformer or track power without the need to disassemble the turnout. Also, when properly wired the K-Line switch controller itself also provides lit red or green switch position indication. These turnouts are available as manual or remote in both O27 and O42 configurations. However, production of these turnouts was discontinued when Lionel acquired K-Line's assets and they therefore had a relatively short production life and can be more difficult to locate than the other turnouts described here.

Locations of guardrails (red) and "ramps" (yellow) on K-Line
turnouts.

A highly unusual feature of K-Line turnouts is a design that allows both modern locomotives and, to a lesser extent, older Marx and other "fat wheel" locomotives to pass through. On each route of the turnout the outermost rail features a standard guardrail to prevent train wheels from derailing on the rail gap near the "frog" of the turnout. The inside rail, near the frog, features a "ramp" design that allows "fat wheel" locomotives to pass as well, provided that the "fat" geared wheel is on the ramp side of the turnout. Thus, with a carefully designed layout a Marx or Prewar locomotive can travel around your layout, but only in one particular direction.

The downside of this ramp system is that it can make for a bumpy ride for all locomotives and cars as they pass through the turnout and over the ramp. I have not found this to be a frequent cause of derailments, but it can be visually distracting to see cars rock and bump through the turnout and heavy diecast locomotives often pass with a discernible "thud". Also, just as with Lionel turnouts, trains have a tendency to derail when backing up through these turnouts especially when traveling at faster speeds.

In short, if you desire premium electrical features and don't mind the bumpy ride, K-Line turnouts can be worth the hunt for O27 operators.

Marx Metal

A typical Marx manual metal turnout.

Marx manufactured two basic types of O27 tubular turnouts. Of the two, the metal design is not only more common but also the more functional design. These metal turnouts are found in a number of color variations, usually with black or aluminum colored bases. The motor housings for remote turnouts usually come in black or red. A less common version of the remote turnout features a lighted motor housing with red and green switch position indication.

Unlike all of the other turnouts listed here, these Marx turnouts do not have movable switch "points" but instead a large portion of the rails swivels from side to side. This not only allows all wheel types to pass, including the "fat wheel" type, but makes passage through the turnout as smooth as passing over any standard track section. Some non-Marx locomotives and lighted cars have difficulty passing through these turnouts as designed, but a simple modification allows virtually all makes of locomotives and rolling stock to pass through problem-free (see The 5 Minute Marx Switch Fix).

Marx turnouts may be wired for either track power or transformer power, but they operate best on constant transformer power. Also, Marx turnouts are not pre-wired for non-derailing operation, but this may be easily added by the operator using insulated rail pickups. Other than the lighted versions, Marx remote turnouts do not feature a switch position indicator.

In short, Marx metal turnouts are no-frills, but they are inexpensive, durable, and can be made compatible with nearly all locomotives and cars.

Marx Plastic

A Marx plastic O27 turnout.

The other Marx turnout you may find is the plastic version. Unlike their metal counterparts, these turnouts use movable points like prototype turnouts. They lack traditional guardrails but feature a special spring-loaded attachment that both serves as a device to help keep wheel flanges from derailing on the gaps in the rails in the frog and also allows "fat wheel" locomotives to pass by dropping out of the way of the geared wheels when they pass.

Unfortunately, while the switches do an admirable job of working with the "fat wheel" locomotives, the spring-loaded sections are a poor substitute for real guardrails and many locomotives and cars - especially larger diecast locomotives - will derail on these turnouts frequently. These switches work best when trains travel through them in the "trailing point" direction - meaning from one of the two diverging routes toward the single route. When traveling through the opposite "facing point" direction they are prone to derailments on the open frog.

The video on the left shows the operation of the spring-loaded attachments on the turnout. One attachment has been removed for clarity on the video. 

In short, while these turnouts are inexpensive and are also available in O34 variants, they are not a good choice for most operators as their design, while innovative, makes the prone to derailments.

Happy Railroading!

 

The 5 Minute Marx Switch Fix

As I have mentioned in previous posts, I use Marx turnouts (switches) throughout my O27 layout. I like these because they are compatible with virtually any locomotive and rolling stock ever made that is designed for O27 curves. I find that all makes of trains travel through these turnouts smoother than on modern designs, especially at high speeds or when backing up. These turnouts are also easy to find, durable and inexpensive. All that is required for nearly all locomotives and cars is a simple 5-minute alteration to the original Marx design.

What Is The Difference?

A typical Lionel O27 turnout. Note the guardrails.

The main design difference between old Marx turnouts made between circa 1940 and circa 1970 and those of other companies is their "frogless" design which eliminates the need for guardrails on the turnout. Modern turnouts operate much like the prototype (real railroad) designs with movable "points" at one end which lead the wheels of the train to one of two routes. The spot where the diverging route meets the inside straight rail a v-shaped rail, called a "frog" is created. Also, a gap must be present in the inside straight rail and the inside diverging rail to allow the flanges of train wheels to pass. To prevent the train from derailing on this gap guardrails are required on the opposite side which keep the wheels from falling into the gap.

A typical Marx metal turnout. Note the movable rails.

On older Marx turnouts, both the diverging rail and the center rail swivel as a single unit from route to route. Thus there are no frogs and no gaps, and therefore no guardrails are required. This creates a smoother passage for the train as there are no gaps to "bump" through and no chance of wheels derailing on such gaps. So, while more modern turnout designs for O27 trains look more realistic, the old metal Marx design offers several operational advantages.

"Fat" Wheels

So why did Marx design their turnouts differently than other manufacturers? The main issue is the so-called "fat wheel". On many early O gauge and O27 locomotives the spur gear from the locomotive motor turned the drive wheels directly via large gears attached to the back of the drive wheels themselves. The diameter of these gears was often the same or only slightly smaller than the drive wheels themselves. This created a "fat wheel" that could not pass through guardrails or other track obstructions. While most manufacturers abandoned the "fat wheel" prior to 1942, Marx maintained the design on all locomotives until 1950, and continued it on many Marx locomotives until the end of Marx production in the 1970's. Therefore, Marx kept the frogless design to accommodate their contemporary line of locomotives.

Fat Wheels on a Marx #400 Steamer

Pick 'Em Up Right

The other difference between Marx products and other, and the one that requires our "fix", is in the design of the electrical pickups on the center rail.  Marx locomotives, as seen in the top photo on the left, use a long copper strip that slides along the center rail. This design maximizes the contact area with the center rail and also prevents the pickup from catching on any gaps that may exist in the center rail due to crossings, turnouts or other special track sections. These pickups, which are also used on Marx's "small gear" locomotives, have no trouble passing through turnouts made by any manufacturer.

Smaller Gears on a Lionel #8141 Steamer

The Catch

Lionel and most non-Marx locomotives use small roller wheels to contact the center rail. These wheels reduce friction with the track but have a smaller contact area and are susceptible to snagging on small gaps in the center rail. Lionel turnouts are designed so that these gaps are small enough to prevent snagging by these pickups. Marx turnouts, however, are not designed this way and some roller pickup locomotives, but not all, may catch on these gaps in the Marx turnout and derail. This is why many O27 operators believe that Marx turnouts are not compatible with Lionel and other locomotives. We will see, however, that this problem can be easily corrected.

Getting Pinned

Center rail gap on unmodified
Marx turnout when set for straight
route.

Center rail gap on unmodified
Marx turnout when set for
diverging route.

The photos above show the locations of the two center rail gaps on an unmodified Marx turnout. These gaps are sufficiently large that roller pickups on some locomotives and cars can drop into the gap, snap the rail, and cause a derailment. The fix for this is to bridge these gaps with simple rail joiners - any O27 brand joiner will work. Simply insert a track pin into the fixed center rail so that it rests as close as possible - but not touching - the swivel rail on either side. This provides not only a physical bridge but an electrical one as well, improving the performance of roller pickup equipment through the turnout.

Friction does well to keep the pin in place, but a drop of ACC cement or a quick touch with a soldering gun will make the fix more permanent.

Marx turnout modified with track pins.

Marx turnout modified with track pins.

And thus, your Marx turnouts may now accommodate not only your Marx locomotives and rolling stock, but that of Lionel and other manufacturers as well! Please note that this trick works only with the metal Marx turnouts. The plastic Marx O27 and O34 turnouts are different in design and are not recommended for use with the locomotives of other makers.

**Note: I have an eclectic collection of postwar and modern locomotives by a variety of manufacturers. To date, I have found only one locomotive for which this fix does not consistently work. That locomotive is a "Beep" diesel by RMT. However, I have found another simple solution that works for that locomotive - and any other that shares its difficulty with Marx turnouts. I will share that solution in a later post. Until then, Happy Railroading!

A Simple Christmas Tree Layout

Here is the 2015 edition of my family Christmas tree, train and village. The village and train took me about an hour to construct from start to finish. Below are the materials I used and tips for your own display.

Laying The Foundation

Many hobbyists build a solid platform for their holiday trains and reuse them year after year. I have always intended to do this, but honestly I have just never had the time. Therefore, this year's layout, like all before it, is simply laid out on two snow blankets on the living room carpet. The blankets are 30" by 8', and I simply laid one on each side of the center line of the Christmas tree. Don't worry about any lumps as these just represent snow drifts or hills. The ski hills on my display are simply spots where the snow blanket must pass over the tree stand. In past years I have substituted a simple white bed sheet for the snow blankets with good results as well.

Choosing The Track

Unlike my permanent layout, I do not use tubular track for my Christmas display layouts. I use MTH Realtrax sections instead. Since I do not have any turnouts or crossings on my Christmas layout there are no compatibility issues with my Marx and Lionel trains. The MTH track is great for temporary floor layouts because the pieces snap together and hold together well and the molded roadbed helps keep stray carpet or blanket fibers out of the trains. Lionel's Fastrack would also be a good choice if you have that on hand. These track systems are more expensive than traditional tubular track, but I believe in this situation the advantages outweigh the costs and on a small layout the expense is not so great.

My track plan is a simple oval. There are no turnouts, crossings or other special track sections. Only simple straight and curved sections are used. Make your oval large enough to completely encircle your tree, but small enough to avoid your trains being stepped on or encroaching on the living area of the room. In my setup only eight curves and six straights are required, but your layout may vary based on the size of your tree and stand.

Some other innovative layout designs may be found at Thortrains.net.  This site was established by a long-time O27 operator and offers many great tips about many O27 train topics, although it has not been updated in quite some time.

Powering Up

Just about any transformer will work for a small display layout such as this. I am using a Lionel CW80 this year. This is a modern power pack that was commonly included in Lionel starter sets of the 1990's - 2000's. I am using only a single pair of feeder wires to the track as solid electrical connections are another advantage of the RealTrax.

Structures

There are literally dozens of brands of ceramic and porcelain Christmas village structures on the market in a wide variety of price ranges and scales. Some are as small as HO scale, while others are larger than O scale. Most, like mine, are slightly smaller than O scale, which makes them just right for traditional O27 trains. My village was purchased at an after-Christmas closeout sale more than 20 years ago but similar ones are available today at various craft and collectibles stores. Choose the style that works for you.

Another option is to use plastic structures like Bachmann's Plasticville line or old Marx plastic buildings - or the K-Line structures made from old Marx molds. These,too, are undersize for O scale, but look great with O27 trains. Plus, these structures can be used after Christmas on your permanent railroad as well.

Still another option is to use do-it-yourself cardstock structures.  A great variety of neat and easy to build Christmas structures is available for free download from Thortrains.net.  These structures can be downloaded for free and printed from your home computer. Simply print, cut out, and paste together. These buildings are fun and whimsical, and look great with O27 trains. My sons and I have made several of them for their layout.

Choosing The Trains

The choice of trains for your display are a matter of taste and reliability. I like to choose smaller O27 trains that have reliable engines and good-running cars that require very little attention. In the past I have chosen everything from Marx battery-operated sets to premium Lionel passenger and steam locomotive sets. My goals this year were colorful, whimsical and kid-friendly trains.

My choice of locomotives this year is the Christmas-themed North Pole and Snowflake "Beep" by RMT trains. The "Beep" is a fantasy 4-wheeled miniature version of a GP-9 locomotive. Its small size looks great with my Christmas village and its two modern can motors give it reliability and plenty of pulling power. It is also geared to run slowly, so even at full throttle the train will not leave the rails. When we tire of diesel power the back-up locomotive is a Thomas The Tank Engine by Lionel from the late 1990's. With forward-only operation, this locomotive is easy for my little engineers to control.

The rolling stock for this year's display makes up a "mixed" train - one featuring both freight and passenger cars. The freight cars include a Lionel MPC "Lifesavers" tank car from 1978, which looks like a giant roll of candy on wheels, and a red Southern Pacific gondola car by Lionel MPC from 1977 which has been fitted with a Santa with sleigh and reindeer that I recycled from an old Christmas decoration. The passenger cars are Annie and Clarabell from the same Thomas set as our back-up locomotive. These cars add to the whimsy and fun of the railroad, and give my boy engineers a reason to stop the train at the passenger depot from time to time. Pulling up the rear is a red Western Maryland "safety" caboose, also by Lionel from the early 2000's. This is a lighted caboose that adds to the overall fun of the train.

Don't Forget Sound!

Nothing adds to the fun factor of a holiday train display like a whistle or horn on your train. If, like me, you have selected locomotives lacking on-board sound, you can use my BLUETOOTH speaker trick to add horn, whistle, chugging or even Christmas sounds to your train at a very reasonable cost.

Ready For Action

A train around the Christmas tree is as common a holiday tradition as pumpkin pie and sugar cookies. You don't have to spend a great deal of time or money on a fun and functional Christmas tree train. Plan ahead with reliability and fun in mind, and you are sure to have a wonderful time running trains around your tree.

O Gauge from Menards

Home improvement retailer Menards continues to expand its line of O gauge train offerings, including rolling stock, structures, vehicles, scenery and even traditional O-31 tubular track. Items may be purchased in stores or online. The line also includes assortments and multi-packs, like this cool 14-piece boxcar set!