barry.irwin1 wrote:
How much running Etc

You need to define "route" and "in London" more precisely, but there is
a route (continuous journey in passenger service in the same train
without reversing) that is wholly within Greater London and takes (or
did so when I last researched it two years ago) 20 hrs 8 min.

Hammersmith (H&C) dep. 04:49
Barking arr. 00:57

--
Richard J.
(to e-mail me, swap uk and yon in address)