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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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