I have a K line GG1 #4912. I am currently having trouble keeping cars on the track behind the engine. I run tubular 31" diameter track. I know that's tight for this 20 wheel engine, but it works most of time. Now it's derailing, or causing the next car to derail. I am trying to run it with a Lionel box car to replicate a consist that ran into Chicago. The power trucks don't allow for much movement, and the couplers are tight onto the first set of 4 wheels. Seems like there should be more play. Any thoughts.
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