MUNI METRO OPERATIONS HISTORY – CAPACITY AND DEMAND
Angelo Figone, Transportation Consultant; Former Chief Transportation Officer, Rail
The concept of a Market Street subway dates to Muni’s formative decades with a “ Report on Rapid Transit for the City of San Francisco With Special Consideration to a Subway Under Market Street” issued in 1931 by City Chief Engineer M.M. O’Shaughnessy. Subsequent studies throughout the 1940s and 1950s culminated with the establishment of the BARTD system and the collaborative effort to build a two-level subway with BART and MUNI rail operations. Begun in 1967, the subway construction was completed in 1977; however, initial Muni Metro (MM) revenue operations did not begin until February, 1980. Thereafter in phases, the existing surface streetcar lines N, K,L,M and J would transition from surface operation to surface-subway operation utilizing then-new Boeing-Vertol light rail vehicles (LRV).
Initial Capacity Design:
In 1967 – the commencement of subway construction – the five surface streetcar lines were scheduled for peak-period headways of 2-8 minutes with a peak-hour trip count of 72 producing a maximum capacity of 7920 volume (200 % load factor of 55 average seats/car). 100 cars were scheduled for the peak period. Initial planning prior to SLRV design and purchase called for 78 cars with an option for 14, but the final purchase totaled 100. It was assumed that replicating the 7920 peak-hour capacity would be accomplished with a 50% reduction in running time in the Market Street segment, a 25% increase in car capacity and a projected spare ratio of 20% yielding 80 maximum scheduled cars. (more…)