Wheels on a vehicle without power will still generate torque for a short moment when Forward (w) or Backward (s) keys are pressed.
By pressing repeatedly the forward or backward keys, the vehicle will continue it's movement.

Possibly related to v0.9.3.0: optimized electricity circuits recalculation.
Example of vehicle provided by Junkasaurus:
https://steamcommunity.com/sharedfil...?id=1512460204