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[quote]QUOTE: Originally posted by M636C Dave, The B-B-B locomotives are generally regarded as much easier on curves than the equivalent C-C, and no worse than than a B-B. The centre truck doesn't have to do anything other than hold up the centre of the unit. The two end trucks do all the guiding, and the centre truck can just follow the track. The suspension is designed to allow free lateral movement, and shouldn't apply any excess lateral force to the rails. They have been very successful in Europe, in Switzerland and Italy particularly (although the Italians also have a large number of articulated B-B-B locomotives as well as more recent rigid units). Peter [/quote] Regarding the comparison of B-B-B being easier on curves than a C-C, does that include C-C's with radial steering? One other point of interest. If this mid-truck concept works for locomotives, why not use it on freight cars to increase load limit above the current 286k/soon to be 315k limit? Frankly, with the advent of radial steering in three axle trucks, I would think the three axle truck would be the way to go for increasing load limits on freight cars. Then again, with standardization, it is probably cheaper to go 2-2-2 using run of the mill three piece trucks than to go with the hassles of radial steering components.
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