It seems that after the fuel type changes, trains that don't have "fuel" now have no power?

In my case, Electric Locomotive of "Realistic Electric Trains (Fork)" are probably the slowest possible, even while empty, running at a max speed of about 0.3kph.
Turning the feature off makes the trains move again.

Thanks for the good mod.

I installed the mod, and at least it's functional now. Could you retry with version 0.1.13? I'll try to tweak acceleration in a future update.

Possibly related: the trains from "Electric Train" by magu5026 (https://mods.factorio.com/mod/ElectricTrain) currently do this. The low-tier electric locomotive with no wagons attached tops out at 0.1km/h, mid-tier at 0.2km/h, and I didn't test high-tier.