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[quote user="SeeYou190"] I hope it will be plausible for 1954. [/quote] [quote user="SeeYou190"] one Central Valley steel truss,[/quote] Definitely plausible, which one? [quote user="SeeYou190"] thee Campbell wooden bridges[/quote] That would depend on what you are running over it.  70ton cars, probably not. I would look into protoype weight restrictions on the different types of bridges.  40 or 50ton cars, definite maybe.  That having been said, B&M had wood covered railroad bridges in service into the mid 1950s on some branchlines.  There are color photos of a railfan trip in one of the B&M reference books with Alco S-(dont remember) switchers (a pair of them) pulling a raifan special across a wood covered railroad bridge.  The bridge may or may not have had steel re-enforcement inside.  Edit: I forgot why I put 2-6-0 in here.  Comparison I guess to the diesels that replaced it. Here is the weight data: <a href="http://steamlocomotive.com/locobase.php?country=USA&wheel=2-6-0&railroad=bm">http://steamlocomotive.com/locobase.php?country=USA&wheel=2-6-0&railroad=bm</a> GP7s by contrast weigh about 245,000lbs, over a shorter wheelbase, with a higher axle loading.   SW-1s weigh about 199,000lbs, have an even shorter wheelbase, but have a lower axle loading than the GP7.  B&M had at least one bridge where the largest locomotive that was permitted was a SW-1, braking was not allowed on the bridge, and speed was restricted to 5 or 10mph.
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