"Paul" wrote in message
...

Also the metro runs 1 hour later on Friday and Saturday nights,
finishing at 2am. How can they do this when London can't?. They must
have to do engineering work and maintenance just like London does.

Livingstone proposed it around 2005? With a later start to compensate on
Sat and Sun to keep maintainance time the same . IIRC the immediate
objections then came from the unions.
Johnson carried the proposal forward, but the plan was still impossible to
implement - by then the line upgrade plans as well as the unions were being
blamed for the lack of change.

Paul S