This two-mile tunnel running on solar power just switched on today. It's part of the Paris to Amsterdam line and the first in Europe, promising to save a ton of energy that would otherwise be wasted during the trip.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/acvBngY358M/the-first-solar-tunnel-to-help-power-high+speed-trains-just-opened-in-europe
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