It would seem that DTG hasn't properly looked at the timetables for this route as there is a massive gap in the timetable on service mode. If you go to Newton using explore on foot at 1245, there is a train that leaves at 1250 and then nothing until 1421. I'm hoping that this is just an error that will (hopefully) be fixed and not something DTG has left out on purpose as it takes a bit of the realism away from what is an excellent route.