On Thu, 17 Jan 2008 23:13:08 +0000, Charles Ellson wrote:

The problem seems to be with the type of loading that 313s cause on
the DC supplies. In the early 1960s parts of the DC line had a 2 - 2.5
minute headway (back of envelope calculation gives about 2 Bakerloo
trains and 4 6-coach BR/LMS trains taking power) and the substations
coped with that but when cl501s were replaced with 313s they were
unable to run as 6-coach as they tripped out the sub-stations when
moving off.

Interesting, especially considering the line is fitted with (IIRC
Silverlink-style) "6 car stop" signs.