Earlier today I was doing a move at Reading. During the move, I slowly passed a shunting signal at danger (I didn't apply enough brake force). The game punished me with a "Service failure: signal passed at danger" message, and dropped me back into the main menu. While I understand that a SPAD is a serious offence on the real railway, I think that ending the game is too harsh for when you're playing in service mode (especially during a shunt move). Getting yelled at by the dispatcher should be enough.