thank you for the reply dave. how does one check the gauge of the wheels? I will check voltage with a multimeter. it just derails at the switches, both directions. thank you so much for your help.

dave I have absolutely no idea on the track. the engine model is 1654 if that helps. the track is from the 40s and the switches are new.

I am using the 5122 and 5121 switches and the engine keeps jumping track at the switch locations. it seems like the engine is bouncing over the switch. I am new to the hobby so any and all help is appreciated. thank you.