Steam Locomotive Side Rod Configuration Question

Hello,

I have a question regarding steam locomotive side rod configurations. In the case of a 2-8-4 or 4-8-4 wheel arrangement, why is the main rod connection sometimes on the second axle back, as in a locomotive usually used in passenger service, and sometimes on the third axle back, as in a locomotive usually used for freight service? Does one location provide higher net speed (more RPM) and the other more torque for starting heavier trains?

Thanks,

Greg

9/24/201:22 PM

Original Post

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