you have to build up the roadbed by .280 thousands. i had the same problem with atlas flex track and ez track.  one quarter inch plywood and 30 weight tarpaper worked perfectly.

I just bought a new bachman 2-10-4-santa fe steam loco. and tender at a train show  item #51204 . in the box is a small plactic bag that contains 2 tiny 3 pronged metal parts no instructions as to their use .can anyone help?