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[quote]QUOTE: Originally posted by timz Okay, see if this is what you mean. The two trailing axles are maybe 15 feet apart (and so the trailing siderods are 15 ft long). The firebox is down at axle level? and it's maybe 8 feet wide? It's all ahead of the flange of the rear driver and behind the next-to-rear driver? And the pins on the two rear driving axles are lengthened so their siderods are farther out from the centerline of the engine, far enough to clear the firebox. I guess the siderods ahead of the next-to-rear driver would be in the normal places, so the main rod could still be outboard of them? Or the main rods would always have to drive the leading axle? Where would the engine's frame be, between the two rear drivers-- below the firebox? Don't forget we need an ashpan too. [/quote] Yes. Someone more interested in steam than I would have to fit in all the specs, I'm more interested in the trade off question - more weight on drivers vs more steam. GN rick pointed out the 2-8-8-0 of GN, which had smaller drivers supporting the firebox above, yet which still could run at near passenger speeds. But if the desire was for greater speeds via larger drivers while still keeping weight over the drivers and greater steaming requirements, would this oddball idea work?
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