So I'm not sure if this has been suggested before. But I was thinking something that would be useful is the ability to path in other freight locos to lead freight trains in timetable mode. So say I have a 66 lead freight train, but I would prefer to operate a (hypothetical) 60, 70, or 37 lead freight train. All you'd need to do is select one of my alternative selections and away you go. This would only be available to the player as I envision it hopefully deleting the need for messing with the timetable, but would add significantly to the replayability of routes.