Algodoo

Russian train v1.3. Arrow keys to move the train. A single press of the down arrow - turn on / off the brake. A single press of the key "C" - to close the doors, a single press of the key "O" - to open the doors.

Version History:
v0.0 - starting project.
v0.1 - added one carriage and wagon / locomotive with no moving parts (except the wheels).
v0.2 - added the mechanism of coupling wagons.
v0.3 - trolley with wheels and a wagon - now two different objects, connected by springs.
v0.4 - added two stations.
v0.5 - added the mountain without a tunnel.
v1.0 - added the mountain with a tunnel.
v1.1 - changed the tunnel in the mountain.
v1.2 - now you can open / close the doors.
v1.3 - now the doors have become more stable.

I'm sorry for my bad english, I'm Russian.