I managed to use the deadhead function to enter a train shed during deadhead time. But do not ask how I achieved it. It is quite counter intuitive and I had to experiment with the sliders to make it work. Hint: (The departure times have to be set correct before you can change the schedule directions.)

Yes I have seen this. Working backwards threough the process from the departure time seems to provide the most consistent results. thanks for taking the time to post a solution. Appreciated.