> A little tower on the southeast corner of California and Powell holds a Muni employee who signals with lights to cable cars on both lines whose turn it is to

> A little tower on the southeast corner of California and Powell holds a Muni employee who signals with lights to cable cars on both lines whose turn it is to crest the hill. This is designed to prevent the possibility of cable cars hitting each other at the intersection. Here's a Street View of that tower: https://goo.gl/maps/MqhKBSS6EYNYNXMQ7 https://goo.gl/maps/MqhKBSS6EYNYNXMQ7