Thread: Walk-through trains
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Old August 13th 09, 03:19 PM posted to uk.transport.london
Bruce[_2_] Bruce[_2_] is offline
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Default Walk-through trains
On Thu, 13 Aug 2009 20:38:46 +0800, "DW downunder" noname wrote:

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).


Correct.

The missing statistic is the post-Yerkes standard, which was 11' 6".

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