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[email protected] · December 15th 20, 07:41 AM posted to uk.railway,uk.transport.london

On Mon, 14 Dec 2020 23:56:48 +0000
Charles Ellson wrote:
On Mon, 14 Dec 2020 16:06:54 +0000, Basil Jet
wrote:

On 14/12/2020 08:56, wrote:
On Sun, 13 Dec 2020 21:50:13 +0000
" wrote:
On 12/12/2020 14:05, Graeme Wall wrote:
Shouldn't they have done that before ordering the new trains?

When the New York City Subway started commissioning and testing what was
then the brand new R-38 in the 60s, they realised that there was loading
no gauge on some of the tighter curves, particularly on the Fulton
Street Line.

This prompted the works to allow gauge clearance as well as removing
some of the walkways around towers (signal boxes).

IIRC something similar happened when the 73 stock arrived on the Piccadilly
line. The new cars were longer and so the throw was greater and the tunnels
linings around south ken had to be "shaved".

IIRC vertical curves rather than horizontal or was that the Central
Line ? Gauging runs at low speed hadn't sufficiently imitated normal
running conditions.

Don't know TBH. I do know the 2009 stock on the victoria line is too wide
for other tube lines, though I suspect that is more due to profile than actual
max width. They're definately more slab sided than other stock.