Notes on Designing, Building, and Operating Model Railroads

The last blog entry ended with the arrival of a friend who suggested a less labor-intensive method of matching the railhead height on two different manufacturers of code 83 flex track. The image above shows the unorthodox tools for this method. In a nutshell, masking tape ramps were installed to raise the end of a Shinohara track switch or flex track so it would be compatible with the top of the Atlas flex track. I used three-quarter inch blue painters tape, a pair of scissors and a metal ruler to build these simple ramps. Thanks to Mike Weiss for the idea.

Start by marking on the roadbed the location of the last tie on the track that needs to be raised. Cut a piece of masking tape three inches long and place it on the roadbed along the track centerline and aligning with the mark for the last tie. Place another three inch piece of masking tape on the other side if the center line from the first piece. Repeat this process with two inch pieces of tape. as a final step, cut a piece of one inch tape and install it perpendicular to the centerline but aligned with the mark for the last tie. Check how the track fits over the ramp. Add another piece of tape if needed, but the thickness of three pieces of tape should be fine.

In the following images, I used tape to raise one end of a Walthers/Shinohara track switch. Click on any of these images to view larger versions.

Check your rail with a metal ruler to see if your tape ramp did the job.

Once you are satisfied with the ramp, paint it a grey or earth color to seal the tape and disguise the ramp.

As my layout is sectional, there are a number of places where track crosses from one section to another. There are a few places where the sections have an uneven interface. Use a metal straightedge to check these spots where the track will cross over a section joint.

Each instance is slightly different and a careful eye will determine how long a ramp and how many layers of tape will be needed. With a pencil, mark the location where the roadbed is at the proper level then install a couple of tape strips and check again with the metal ruler.

Add tape layers to make the transition smooth, but note the tape strips should be shorter as the layers increase. Once you are satisfied with the new transition, paint it a grey or earth color to seal and disguise the tape.

Take the time for a few extra steps when installing your track so you end up with a smoothly running railroad. You will find this is much easier than returning to a problem area later to tear it up and rebuild.

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I was surprised to find issues in regard to track compatibility as I started to install track in the Wheeling Freight Terminal staging yard. I was using Walthers/Shinohara track switches and Atlas flex track. All were code 83 rail, but there was something amiss.

Tie Thickness

The National Model Railroad Association (NMRA) has many standards and recommended practices that are used across the model railroad industry so our models can operate using components from different manufacturers. Specific rail, gauge and track switch tolerances are outlined across several standards at the NMRA website. One aspect that is not standardized is the thickness of the ties that support the rails. As I am using up lots of accumulated materials with this project, I’ve encountered a tie thickness discrepancy. Click on the next two images for larger versions.

I have accumulated lots of Atlas code 83 flex track as well as several sections of Shinohara code 83 flex track bought at swap meets and train shows over the years. I am using the Walthers/Shinohara track switches on this project and the overall tie and rail height matches the older Shinohara track, but not the Atlas flex track. The height difference is about 0.030 inches. Many people may not worry about a thity-thousandsths of an inch difference, but it is noticable when you push a string of freight cars across an uneven rail joint. Steam locomotives would have some difficulty smoothly operating over the same joint. This situation becomes a problem to solve.

I made transition sections of five to six inch long Shinohara track sections by adding styrene shims under the ties. After prepping the rails on each end, the bottom of the ties on the last two inches of these short track sections are sanded to remove the slick, glossy surface. HO scale 2×10 styrene strip shims are cut two inches long and glued onto the ties under the rails. Once the joint is dry, the shims are carefully sanded to make a slight taper. After blowing the dust away, the shims are carefully painted with Rail Brown to hide their presence. I did not have any grey or black styrene on hand for this project. Here’s a transition section before painting.

When the transition section is complete, it is soldered to a piece of the Atlas code 83 flex track with the shimmed end close to the rail joint. After the flux is cleaned off of the solder joint, a mill file is used to remove any slight bump at the rail joint. Some people may feel a slight taper can be done by sanding the Atlas flex track ties, but without a belt sander at hand I feel these transition sections do the job.

After creating several of these short transition pieces, a friend suggested another method that is much less involved. I’ll cover that in the next post.

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