1992 stock automatic operation central line manual operation Waterloo and city line the London Underground equivalent to the New York City subway Times Square 42nd Street shuttle. S stock Metropolitan Line
If we get a new tube line, then ideally the Northern Line with 1959 stock or the Central Line with the very similar 1962 stock. Rivet’s flawed 1938 stock could sub in on the Northern Line too.
Hopefully, with Just Trains entering the franchise, they can pull off a TSW version of their Metropolitan line. This would provide something for a mix of the 1973, 1996, S7 and S8 stocks to run on. The '96 stocks have been automatic now for a while, so maybe not as fitting, but the '73 have and will always be manual.