We were about to embark at Dover, when
(Charles Ellson) came up to me and whispered:

You can e.g. send LU and NR electric stock into
Richmond but neither can take the wrong direction at
Gunnersbury as
one requires power between the 3rd and 4th rails and the other
requires the power supply between the 3rd rail and one running
rail.
Normal LU signalling is not intended to have traction currents
flowing
in the running rails.

There's no reason what LU stock can't be converted to third rail
operations - cf. 1939 stock on the Isle of Wight.

--
Paul Cummins - Always a NetHead
Wasting Bandwidth since 1981
IF you think this http://bit.ly/u5EP3p is evil
please sign this http://bit.ly/sKkzEx

---- If it's below this line, I didn't write it ----