Not all routes can go far enough to get to a place where it makes sense to stop a train, but for a service or scenario to end or begin, the train has to be stopped. That combination leads to stopping or starting trains in places where they would just drive on through in real life-like CSX traffic at Rockwood, or the freight services at Reading, those trains just drive through, but limitations in TSW force us to stop and get out. So, why not add in support for a service to end while the train is moving, and to put the player in the cab of a moving train at the start? Probably more importantly than just being realistic, this could allow for a train being split into multiple services where appropriate, like on a long route, without adding annoying stops to the middle of a drive. That way, someone who wants to drive a whole 150 mile route in one go like the real guys do it can do just that, without getting stopped in the middle of the trip for "crew changes," while at the same time, someone who only wants to do the middle 50 miles of the route right now can do just that, and still get completion on the services list. Both play styles can be supported if services can be completed and started while the train is moving.
