2L24 Brighton to Lewes, as soon as you start the game there's a 8 car 377 overrunning the signal on the adjacent platform , the timetabled service is unplayable.
Double post but the unit to the left leaves at 11:01:45 ish, and clears the junction. Eventually I left Brighton about 15 minutes late.
If you spawn walking at 10:45, you can complete this service without this train being in the way and complete it on time.