ehbowen
Engineer
Gotta be very careful about that and don't want to encourage it one bit as you can cause more problems by doing so, especially if part of the train is on a turnout or curve. However, if any situation does justify pulling the emergency brake valve, it's a break-in-two if you don't very quickly feel a deceleration starting (meaning the air in your portion of the train may be bottled up, accidentally or deliberately [vandalisim/sabotage]).