One thing I’ve discovered on class 158 if you wish to start away quicker from stations to do this on the switch panel isolate the emergency bypass isolation key switch then on back panel above driver isolate traction interlock isolation this will allow you to depart station and have class 158 doors automatically shut as you start moving I only discovered this by fiddling with switches
Usually I close the doors ten second before scheduled departure, then when the door interlock goes off just accellerate away. So long as the loading cycle has completed you're fine