Train Station Chief using the old telephone in the San Antonio de los Cobres train station (Argentina).
Yes, it still works! And it's the only telephone that connect with the other stations of the line. It requires no power, just a hand-craked dynamo to call out.
This train line is sometimes called "Tren a las nubes". For more information, read en.wikipedia.org/wiki/Tren_a_las_Nubes