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Chapter 1 x Executive Summary 1-6 The Dumbarton Corridor includes approximately 18 miles of existing rail infrastructure in the Peninsula and East Bay, including the Dumbarton Rail Bridge across the southern part of the San Francisco Bay. The Dumbarton Rail Bridge carries a single railroad track over approximately 1,400 feet of steel truss structure, including a large swing bridge designed to allow watercraft to clear the crossing. Adjacent to the Rail Bridge is the Dumbarton Highway Bridge, which carries State Route (SR) 84 over the San Francisco Bay, and is the shortest such crossing at approximately two miles long. The Highway Bridge connects Menlo Park on the Peninsula to Fremont on the East Bay. The tolled Highway Bridge provides three lanes in each direction except a segment with seven lanes at the toll plaza. There is also a separate two-way bicycle and pedestrian lane along the south side of the Highway Bridge. In terms of public transit service, most services only run on either side of the Bay with the exception of transbay bus service. There are currently three transbay express bus routes that operate on the Dumbarton Highway Bridge: the Dumbarton Express (DB), Dumbarton Express 1 (DB1), and Stanford University’s Line U. While these routes serve Stanford University and major employment destinations in Palo Alto, they do not directly serve several other major activity and employment centers on the Peninsula such as Menlo Park, Redwood City and portions of Santa Clara County. Due to limited operating funds, transit service is often infrequent and not well- integrated or timed with other existing transit networks. Multiple transfers with potentially long wait times are required to reach some key destinations and buses experience the same congestion-related delays as auto drivers. Private employer-sponsored shuttle services around the region, which provide limited stop bus travel to large employers have mushroomed within the last five years. The Bay Area Council and the Metropolitan Transportation Commission (MTC) performed a study, which summarized private shuttle data from 35 shuttle sponsors from 2012–2014. The data show that shuttles carried over 9.6 million passengers in 2014, and if private shuttles were treated as one transit system they would represent the seventh-largest transit system in the Bay Area. The data also show that up to 50 shuttles per day traveled between San Mateo and Alameda Counties during the survey period. Several employers have also contracted with private ferry operators to provide commuter service for employees where bus travel is too lengthy and impractical. City-mandated limits on automobile trips to the campuses of large employers have spurred the need for these employer-sponsored services. As shown in Figure 1-1 multiple passenger rail services exist in and around the study area. Passenger rail service in the East Bay that crosses county lines includes the BART District, which serves employment destinations in Alameda/Contra Costa/San Francisco Counties; Altamont Commuter Express (ACE), which connects the Central Valley / Tri-Valley with employment destinations in Santa Clara County (San Jose); and Capital Corridor, which originates in the Sacramento area and serves destinations in Alameda/West Contra Costa/Santa Clara Counties (San Jose). BART is an urban transit system and while service is relatively frequent throughout the day, it makes many stops and trains to San Francisco are especially crowded during the peak periods. ACE and Capitol Corridor are well-suited for traveling longer distances but have very limited service in the off-peak periods. 6.1.D. - Page 15