"Bruce" wrote in message
...
On Thu, 13 Aug 2009 12:22:13 +0100, "Recliner"
wrote:

The ever-reliable Wiki source says that the 2009 stock is 2.68m wide and
the 1973 stock 2.629, so the 2009 stock is apparently 5cm or 2" wider.
It also says that, "Unlike the 1967 Tube Stock, the trains are built 40
millimetres (1.6 in) wider to take advantage of the Victoria line's
slightly larger than normal loading gauge compared to the other deep
level tube lines."


Ironically, one of the reasons why the Victoria Line tunnel was built
to a larger diameter was to reduce air resistance. ;-)


The internal diameter was (IIRC) 12'3" (3734mm) for cast iron and 12'6"
(3810mm) for concrete lining segments. This compares with the Yerkes'
standard of 11'8 1/4" (3562mm).

ISTM that the extra car width lies within the general Yerkes tunnel internal
diameter, and may be part of the process of reducing gaps between vehicle
and platform. While it was suggested above that 20mm each side won't add up
to much, in a 16m vehicle, it adds two (to the standing capacity), thus 16
to the total train capacity - at crush loading, the extra space is
equivalent to 20 extra pax per train. This is how bean counters work, of
course. But if it means you get to that appointment on time (armpits or no),
you're not going to knock it well some might!

DW down under

This compares