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Ah, my friend; you have come to the right place. The devices you refer to are called bearings. The type most often seen are called High Profile bearings and come in two varieties; fixed, which permit only rotation, and expansion, which permit the bridge to rotate and expand under the effects of temperature. There are also low profile bearings which are not as obvious to the casual observer and are seldom modeled. I model in HO scale. The only company I know of that produces this detail is Micro Engineering. They make a white metal casting of a high profile fixed bearing which may be used for either type unless you are going to invite me or another structural engineer over and challenge us to find all the errors in your bridges. Anyone else wouldn't know the difference. If you are interested, I could tell you how to model the expansion type of bearing. Oh, the MEI detail is best suited for an HO scale bridge of between 50 to 100 ft span. It could be used for a 100 to 200 ft truss bridge in N scale I suppose. MEI also makes bridge kits in N scale, I believe, so you could check them out in the N scale Walthers cataloge. I would model these in N scale by cutting small pieces of styrene and gluing them in the proper shape to make a believable bearing. If necessary, I could send you a sketch. Good Luck. - Ed
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