The doors wont open or dont react when using TAB + mouse click. This happen on TSW 2: East coastway DLC (preserved collection) Chapter 1 Class 377/4 driver 2L33 Lewes - Brighton. The problem happens when go starting..
i have to check. With master key it also dont work.. But if i set the direction to forward its working. I would advise dovetail to do it differently. It should be better if only insert the masterkey and switch it to on would be enable the doors again. The direction switch wouldnt make the difference here if the doors are working or not. I think many people will collide against this problem. And do think it could actually being a bug in game.
I'm pretty sure the doors don't work only when the reverser is in the off position, you can have it in forward, neutral or reverse and they'll work. I think this'll be as it is in real life as turning on the reverser gives power to the controls in that cab, which can be seen when turning the reverser on makes the AWS sound.
This isn't a bug. The reverser must be in forward, neutral or reverse to operate the doors as in real life.