AC or DC?

Robert Wightman has been looking into the question of AC versus DC traction motors, and posted the following long comment.  I have moved it to its own thread.

At the end of the note, Robert asks that people send him additional info if they have it.  I have removed his email address to avoid harvesting by web crawlers, but if someone needs this, just let me know in a comment and I will pass on the address in a private response.

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