Based on comments in the original thread, some questions on requirements.
1. Does it need a bleeder path to apply some TBD minimum voltage to keep the E-unit from cycling into neutral? Or can we assume the engine is locked-in-forward?
2. Is soft-start like the AF station a must-have, nice-to-have, or don't care?
3. Given thermostatic replacements (Lionel #132-44) appear to be $25-30, are there any cost/size/complexity guidelines that, if exceeded, would nix the project?
4. As brought up in the other thread, there are layout-level off-the-shelf control systems with station stop/start capability and many additional features. Is the focus here is on just a single-station?
Background material:
I can't find it now but while hunting for 132 info I think I read the Nichrome wire has a nominal resistance of 60 Ohms (or something like that?).