@tubedriversarah: When I mention the Underground being different to the way national rail works, I'm not talking about it in the context of driving to certain lines. I mostly meant its difference in the way the signalling and control works and maybe that's a video for another time but I find it fascinating as I do dip my toes into both sides of it on the Bakerloo line. The signalling for example are quite different as are a few other things such as station staff, service control and drivers who are all integral to the running of the service all work in line with each other. #work #tube #londonunderground