Jumping truck

[Herc Driver]

I've had that very experience of bending flex track and getting a ever-so-slight out of gauged section. Not even perceptible to the eye, but would cause a derailment of very light weight cars, or the rear wheel sets of my J-Class 4-8-4. I just assumed I didn't do a good enough job of laying down the flex track, removed the entire piece and installed snap track. That solved my problem.

Nowadays, I try to run a passenger car over all the track to hunt for problem track areas. You can really feel the car slow down and bind up when it traverses a bad section of track that might be out of gauge, or too tight a radius.