Your description of the problem is not clear to me. Are you saying that the two problem steam engines are derailing when the are run through the straight and curved section of both switches? The other 3 engines, two diesels and one steam engine, do not have any issues going through either the straight or curved sections of the switches.
If the two Lion Chief steam engines are derailing and the others aren't then you need to look at those two engines to see if the wheels are dirty or a traction tire is loose, etc. Another problem may be dirt in the switches that only affects those engines. Try cleaning both the engine wheels and the switches first. You will be surprised at how often dirty wheels or track is causing problems with some engines and not others. This is always the first thing I look at when there are electrical or derailing issues on my layout. NH Joe
