I have recently been playing the East coastway dlc with the class 377 which has the button to release the doors with SDO but it doesn't work.Is this supposed to work?Am I doing something wrong?Also with the new Southeastern Highspeed route and the class 375 will SDO work?
SDO is working as designed. That is to say, not the same as in real life. This was mentioned in a stream some time back, and there are no plans to change it.