Let's take a systematic approach to the issue.
1) Remove the cars and leave the desired engines on the inner track and outer track. Do they work in DCS?
2) Tell us how your layout is wired and if there is a separate power supply for each loop, or one power source for both. (Tell us what transformer you have and how it is wired).
3) Check that the engines do not have conflicting (the same) engine ID number.
4) Are both engines in Run mode? (Been a while since I ran MTH engines...)
