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[quote]QUOTE: Originally posted by CSSHEGEWISCH Baldwin used articulation in the Centipede (2-D+D-2) and in its very first diesel-electric in the 1920's. The 1920's design had a B+B arrangement with the truck frames being linked together like an articulated steam locomotive. Couplers and draft gear were mounted on the truck frame and the carbody rested atop the trucks. All longitudinal forces were transmitted through the truck frames. Most large straight electrics like the Joes, GG1's and others were also articulated. On the two three-truck designs of which I'm aware (PRR's E3b of the 1950's and the GM10B), was the center truck allowed any sideplay? [/quote] My understanding of the Centipedes, et al, was that the underframe was in two separate sections ie. not really articulated together with a common truck, and the single carbody itself "floated" on top of the mix. What I have always wodered with respect to the Centenials, 855's, et al, was why not simply articulate two separate engines (carbodys and underframes) onto a common third truck in the middle and operate it as a single B-B-B or C-C-C? If nothing else, it would reduce the rigid wheelbase of the D-D setup.
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