"Spyke" wrote in message
...

Express trains of the type that New York has are very rare on subways and
metros worldwide. In fact, I believe that they are unique to New York.

Not quite unique, as the Met line in London also operates express,
semi-fast and stopping services.

Although can the Met Line's overground service to Amersham etc really be
classed as a subway/underground service or is it a main-line service that
would be operated by National Rail and TOCs if it were in south London?