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Rene' The problem is that I am not an authority on the UP or the Big Boy. If I had to guess, then I think we should consider only steel structures for this crossing. If you want, you could try and find someone in an UP historical society who may know of a wooden trestle on a line which carried Big Boys. Suprisingly, this may not be such a hard question for someone interested in UP history becuase as I understand the Big Boy was limited to running on specific divisions due to its weight. Are you a member of NMRA? If not you may want to consider it. It is not very expensive when you consider you get a magazine each month and access to a wealth of railroad historical information. Even after we find out, we may likely be back to my recommendation to use a structural steel trestle for the crossing. Do you have access to a Walthers catalog for N Scale? I model in HO but I will look next time I am at the hobby store. What I want to know there is does MEI produce trestle bents for N Scale as they do for HO Scale? One interesting thing is that a 30 ft girder for HO Scale can be used for a 55 ft span and a 50 ft girder can be used for a 90 ft span. MEI makes 30 ft and 50 ft girders for HO Scale. The only problem is that the spacing between rivets will be all wrong but who would know besides me? I will check to see what I can find out about speed restrictions on such a trestle. Ed
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