Algodoo

It's a little buggy in cylinders - pistons often turn in cylynder.
s - for establish link with tracks, i - for engine on, - o for fuel intake.
Gear are 2,1,0 on numpad. Be sure you take on only one gear at a time.
Engine works fine with load, but it crashes fastly if not loaded, so make tank run as soon as posible after engine starts.
Sorry for my english
You can use all scene or it's parts freely.