Discussion related to commuter rail and transit operators in California past and present including Los Angeles Metrolink and Metro Subway and Light Rail, San Diego Coaster, Sprinter and MTS Trolley, Altamont Commuter Express (Stockton), Caltrain and MUNI (San Francisco), Sacramento RTD Light Rail, and others...

Moderator: lensovet

  by Motorman
Good morning:
Although I'm quite familiar with the cable car technology, I have no clue what that slot (marked in the picture) is for:
Maybe someone can help me solving this mystery.
Thanxx. :-D
  by John_Perkowski
Have you asked the Municipal Railway Engineering Department?

From the webpage
Questions? Our cable car grip operators and conductors are there to help. You can also Tweet us @sfmta_muni. Or contact the San Francisco Customer Service Center, dial 311 (outside San Francisco, call 415.701.2311).