This is intended as a very light-hearted comment ..... I successfully piloted my way up to Harrow and Wealdstone and then moved up to the stop point just beyond the platform, in preparation for the return trip, then shut down the controls in the front cab. I then forgot the keypress to just switch cabs so I got up, opened the door and tried to pass through the train to the other end. However, I found my way blocked by an awkward passenger standing just in front of the next connectiong door. I could open it ok, but could not squeeze past no matter how hard I tried !