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Is the US finally getting ‘all aboard’ with electric trains?
(www.theverge.com)
This is a most excellent place for technology news and articles.
You don't even need that. Every electric train I know of has pickups on each car, and any break in the catenary or third rail is short enough that it can be bridged naturally by two cars, or sometimes even just one, if it has pickups at both ends.
Some electric trolleys aren't long enough to do that.