On the Brighton Mainline (London Commuter) there are services that are broken because for example in the 1M03 service a train at London Victoria traps another train in and stops me a mile from East Croydon and there are more of these issues on other services like on 1R11 I get stopped just after East Croydon because other trains are in the way and the won't move.
Had a look and I have completed the service 1M03 and got a gold medal on the GE from Brighton to LV. Did you reload a save or hop into another train (other than you one you spawned in at the start) to take over an AI service? Noticed that if you have done either of them things, it can mess up the session. For example you can have a AI with a green signal that refuses to budge, causing a backlog of AI trains waiting at red signals.
London to Brighton best to try and do a run in one go, especially in the Up direction. On the Down you might get away with it if you save after East Croydon.
Tested the service 1M03 on the PC and PS4. PS4 : Stopped in a traffic jam just south of Wandsworth Cmn. The 1F96 to Seaford/Ore and 1R47 from Reigate are causing the issues at LV ( platforms 17 and 16 respectively) at the time of 17:46. On the PS4 the southbound train leaves too early from P17 on a green signal (should be red) and "collides" with the oncoming northbound train which is crossing its path into P16 (If you spawn in at LV at 17:45). It varies little every time and there was an instance when both trains collided head on and auto coupled! If you start the service 1M03 from Brighton in your assigned unit (about 17:46), you could see at the Reigate train stopped at P16 but the Seaford/Ore train has stopped before points outside LV. The signal is green but the points are not correctly set for the route southbound. If you took over that service, it would derail. After a short while traffic would build on the up fast towards London. You may be able to complete the service if you spawn at Brighton at 17:40. Just check at LV when you start the journey. PC : No issues. Did exactly as above and the southbound train was held at a red signal until the train from Reigate terminated at LV. Could complete the service. Sorry for the long post but I had to try and figure this one out. There may be time specific dispatcher issues on the console versions, at least 8th gen. Really hope DTG polish this lovely route, AWS failing to sound, lack of realistic stop markers at stations, pathing problems etc, it just doesn't feel finished like perhaps ECW did on release day
Tsw3 on playstation 5 is a mess frame drops and stutter on the new routes. I don't even bother playing them at the moment. Some tsw2 routes play ok but a lot do still have stutter. We need optimisation please