Train to deliver books inside library

“The mini transportation system—which the library describes as a “state-of-the-art book train,” according to Gothamist—begins in the storage rooms beneath the park and snakes up to the Rose Main Reading Room on the third floor. Each of the 24 carts carry up to 30 pounds of literature at a time, zooming in and out of tunnels and climbing 90-degree inclines along the journey.”
Source: http://m.mentalfloss.com/article.php?id=86601#sthash.K4NgtLtW.dpuf

Train to deliver books inside library
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