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Yo Bob.
As I think this thread shows....times they are a changing.
To sum up, in the past batteries only provided support, in the form of getting the train started and then providing 120v backup for the control voltages, lighting, etc, when traction current was briefly interrupted,
But new state of the art trains are making use of modern high capacity batteries to provide traction current, albeit over relatively short distances for the moment. Don't forget that there are also hybrid trains which have electric suply (CRE/overheads) as their main traction, and a small diesel generator to crawl around with where the juice runs out. These wretched things are very ungreen, as they're dragging loads of weight around for both diesel and electric equipment.
The spirit of Heath-Robinson is alive and well in the 21st century. And all because stupid politicians can't agree to wire the whole network.
As to a source of information, I guess that traction manuals are about the best chance, if you can get them. Ebay is a good source, but don't pay too much.
Best wishes in your quest, BW.
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