This has been well asked since TSW3 and 4 were in release. The bugs follow: -Gangway doors at the back of the train are always being Locked whilst they are open even though there isn't a train at the back connected. This is one that Frustrates me the most because there isn't a train connected so it shouldn't be open. The train I go on the Most is the 387, but to be realistic, their Gangway doors aren't open. For those people who like driving trains to a place and back (such as going to Reigate and Back to Victoria) It would make the route better and more people would love to buy the route and have Electrostar Madness when driving the train. If DTG could do this, it would be very helpful as this has now become a well know Bug
Might want to post this in Troubleshooting as it will get more attention there. Doubtful it will be fixed, the gangway doors have been an issue for well over a year now.