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I had a thought since this last post. If a steam engine's driven axels were allowed to move freely lateraly through the the bearing's center, a roller type bearing would only be loaded in the vertical plane. Limiting the axels' lateral motion would still be a problem though. I read somewhere that it was attempted in recent times to convert an older steam loco to roller bearings unsuccesfully. I could be wrong, but car trucks actually use tapered roller bearings? The axels are fixed lateraly in relation to the truck frame, or is it necessary to have end play in car truck axels? I have read that steam locos have tapered blocks to locate the bearing journal blocks, the tapered blocks adjusting for wear. Are the blocks at either end of an axel used in conjunction to keep an axel square to the frame? How does this affect center to center distance between two driven axels? In a 4-8-4 for example, which axel is the "reference" for the other axels' center to center distance? Maybe these are obscure questions, If nobody knows, maybe point me in a direction, I have a genuine interest in this question.
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