On Tue, 11 Dec 2007 09:04:15 -0000, "Peter Masson"
wrote:


"Mizter T" wrote

Absolutely. Underground sub-surface stock is bigger than all (?)
National Rail stock. I don't think a Met line train would fit down the
tunnels of the GN&CR (i.e. Moorgate line).

The Met stock of the time was used on the GN&C until 1939 (the line was
owned by the Metropolitan Railweay from 1913). It seems to have become part
of the Northern Line, with tube stock used, from 1939, until it was closed
for conversion for the GN electrics.

If the same loading gauge is involved then possibly A stock would be
limited not by the tunnels themselves but by any locations involving
curves. IIRC the use of tube stock by LU was mainly because that was
the most easily available stock WRT maintenance and the associated
stock transfers without leaving the GNC line effectively in
"Drain"-style isolation.