Algodoo

С - open coupling crane
R - position up
F - position down

This valve is used in russian metro cars.

1st position - overcharging, not used (6+ bar)
2nd position - train(default) position (5.1-5.3 bar)
3rd position - 1st stage breaking (4.7 bar)
4th position - 2nd stage breaking (4.0 bar)
5th position - 3rd stage breaking (3.7 bar)
6th position - full service breake (3.0 bar)
7th position - emergency brake (0.0 bar)