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[quote user="erikem"]Thanks for pointing that out to me. 23'6" would give about a foot of clearance between the top of a double-stacked container and the contact wire and a foot of clearance between the contact wire and bridge structure. This would probably be adequate for 25KV, but  likely to be marginal for 50KV. My recollection was that 25 feet above the railtop was proposed for the minimum clearance for 50KV, in part to allow for the rail height to grow with re-ballasting (I may be wrong on this figure). There are copies of the presentations somewhere in my garage - figure a day or two of digging would be needed to find them. [/quote]There's a bit more room than that.  Height from top of rail for hi-cube double-stacks is 20'2".S. Hadid
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