Folder: S.F. Transportation-Buses-Muni-Number 7 Line.
Newscopy: "Inspector William Ratto of the Muni Railway points to dots and arrow painted on the paving to show operator of No. 7 coach just where to guide his vehicle so trolley poles will become staggered and trip the "selectric" switch guiding the trolleys off the Market-st main line onto the Haight-st takeoff. Operators are instructed to steer center of the bus along lines marked on the paving."