the default keys on most trains
F = Neutral (if on reverse), or Forward (if on neutral)
V = Neutral (if on forward), or Reverse (if on neutral)
Q = Brakes (on some trains)
A = decelerate or lower brake level
Z = Accelerate (or decelerate brake level to accelerate)
< = Brake level (on some trains)
> = Brake level (on some trains)
1 or ? = Emergency brake (a.k.a STOP ALL)