I see from Harsig's Signalling Diagrams that Bakerloo Line trains (at least in 2005) could divert southbound onto the North London Line and reverse at Kilburn High Road. There was a sign there on signal WS2 that LUL trains must not pass that signal. Can this diversion still happen? If so is it included in drivers' route knowledge? Are there still rusty rail moves, and has anybody done it?
It is still possible for Bakerloo line trains to reverse at Kilburn High Road, and there is in fact a couple of rusty rail moves each day in the timetable. However for the time being these very rarely run due to a defect with the tripcock tester at Queens Park northbound pfm 4 (It's maintained but Network Rail not LU). At the moment it would only be used if there were a trainee who needs to learn the route, or if there were major problems on the Bakerloo line itself south of Queens Park.