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Inside Europe's trailblazing hybrid trains - BBC News
(www.youtube.com)
This is a most excellent place for technology news and articles.
It doesn’t even have to be “European” question, but seems a lot like the same problem at any scale. Much more locally, here in Boston, the MBTA has had to make similar trade offs between the much higher and longer term investment of electrifying tracks, and multi-mode transit that you can introduce much sooner