Incidentally I noticed, all heavy cars on track, have feature of the moment of a start of motion back. The movement back, begins with small advance. Each short pressing of the key "S", is followed by the movement of the heavy car forward. If to make a number of short pressing the key "S", the car will move forward.
With the keys "A", "W", "D" everything is good, there are no opposite movements.
I don't know how it can influence the solution of other problems. I think that it is worth changing it. We have problems with heavy machinery on other questions. I can't unite it, as the general set of a problem with heavy cars yet.
https://youtu.be/btIaIiisNTc
Connected problems:
https://feedback.bistudio.com/T117728
https://feedback.bistudio.com/T83573