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Where trains traverse mountains, they do so by bridge and tunnel, following rivers as much as possible, on long, winding coursespic.twitter.com/kbhsAYHNVD
The roundabout courses that trains take in the mountains leave those places rural and unspoiledpic.twitter.com/57YHUMlrRf
Trains avoid steep grades, taking the path of least resistance--and of least disruptionpic.twitter.com/cQJfJjd31e
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