On Fri, 18 Jan 2008 06:57:48 +0000, asdf
wrote:

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.

Those date from class 501 (and possibly earlier) days, although not
the original signs. ISTR at least one NLL or DC station has/had
9-coach signs allowing for what was possible rather than what was
"current policy".