Thank you! Those were a treat!
Re: the crewless train and underground moving platform ones: at some stage in the 1950s-- so, roughly contemporaneous with McGinnis's régime at NH and B&M-- there was a proposal that the 42nd street Shuttle in New York (an isolated bit of IRT subway, connecting Grand Central Terminal and Times Square with no intermediate stops-- be automated. (There may even have been a brief test.) I think there was also a proposal to replace trains on this line with some sort of "moving platform."