page_title: San Francisco–Oakland Bay Bridge
section_title: Modification to remove rail service
hierarchical_section_title: San Francisco–Oakland Bay Bridge / History / Later events / Modification to remove rail service
caption_attribution_description: English: The suspension (western) portion of the San Francisco-Oakland Bay Bridge and downtown San Francisco as seen from Yerba Buena Island in San Francisco Bay.
context_page_description: The San Francisco–Oakland Bay Bridge, known locally as the Bay Bridge, is a complex of bridges spanning San Francisco Bay in California. As part of Interstate 80 and the direct road between San Francisco and Oakland, it carries about 260,000 vehicles a day on its two decks. It has one of the longest spans in the United States.
  The toll bridge was conceived as early as the California Gold Rush days, but construction did not begin until 1933. Designed by Charles H. Purcell, and built by American Bridge Company, it opened on Thursday, November 12, 1936, six months before the Golden Gate Bridge. It originally carried automobile traffic on its upper deck, with trucks, cars, buses and commuter trains on the lower, but after the Key System abandoned rail service, the lower deck was converted to all-road traffic as well. In 1986, the bridge was unofficially dedicated to James Rolph.
  The bridge has two sections of roughly equal length; the older western section, officially known as the Willie L. Brown Jr. Bridge, connects downtown San Francisco to Yerba Buena Island, and the newer unnamed eastern section connects the island to Oakland.
context_section_description: Automobile traffic increased dramatically in the ensuing decades while the Key System declined, and in October 1963, the Bay Bridge was reconfigured with five lanes of westbound traffic on the upper deck and five lanes of eastbound traffic on the lower deck. The Key System originally planned to end train operations in 1948 when it replaced its streetcars with buses, but Caltrans did not approve of this. Trucks were allowed on both decks and the railroad was removed. Owing to a lack of clearance for trucks through the upper-deck portion of the Yerba Buena tunnel, it was necessary to lower the elevation of the upper deck where it passes through the tunnel, and to correspondingly excavate to lower the elevation of the lower portion. Additionally, the upper deck was retrofitted to handle the increased loads due to trucks, with understringers added and prestressing added to the bottom of the floor beams. This retrofit is still in place and is visible to Eastbound traffic.
caption: Daytime view of the Bay Bridge and San Francisco seen from Yerba Buena Island
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