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Inside Europe's trailblazing hybrid trains - BBC News
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This is a most excellent place for technology news and articles.
It's not that temporary, electrifying tracks can take decades. In Germany, many smaller towns are connected with routes that are only partially electrified, such a hybrid concept would allow the trains to run electric most of the time and only use the diesel engine on the most remote part of the journey. This is much better than not having a train access at all, where you would have to drive a car instead.