Kim, I found out if I use T, that freigabe switch is moving, and I need to move it to "lock" before driving. If I use the HUD and click with the mouse, I get around that switch. Being an old railwayman, I do like to "rig up" a loco, and "rig down" after driving. At the same time I do not want every switch to be realistic, hence I blame it on me being "lazy".
This is also why I have a problem with TSW. I need to walk to the loco, hear the birds sing, climb in, arggh. But OK when one of the missions ends with I have to go into the bushes in order to pee ... I start to LIKE it.