"Charles Ellson" wrote in message
...
the DC line is 650v which ISTR has been stencilled on many trackside
cabinets for years. OTOH the native trains have been able to run on
750v since at least the c.501 if not also the immediately preceding
LMS trains. ATM there doesn't seem to be an "official" confirmation
which leaps to the front of the Google queue.

I noticed as I was travelling on the GW main line between Didcot and
Paddington that there are lineside cabinets labelled "650V" miles away from
the sections where the London Transport lines run alongside - or even where
the line is OHLE electrified. From memory I think I saw them around the
Maidenhead-Twyford area. What are they for?