Library Automat at Millbrae BART

I saw this machine at the Millbrae BART machine last night:

I figured it was for downloading eBooks to readers, but in fact it's a machine that dispenses physical library books:

A touch screen, similar to an ATM screen is used to display and select from over 800 books that are delivered through an opening in the front of the unit by a robotic arm.

It'd be nice to see this at CalTrain stations but I suppose the library likes the security of putting it in view of a station agent.