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Chapter 1 x Executive Summary 1-7 Caltrain serves destinations along the Peninsula in San Francisco, San Mateo, and Santa Clara Counties. Past and currently proposed Dumbarton rail alternatives have included use of the Caltrain mainline to provide service to these destinations. Caltrain mainline capacity is limited, however. While the modernization of Caltrain will certainly improve this situation with a modern signal system and electrified fleet of high-performance vehicles, the track and terminal capacity are constrained and would not change without further investment in infrastructure in the Corridor that would be difficult to accommodate within a narrow ROW. In addition, plans are being developed for high-speed trains to share the Caltrain corridor as part of the statewide high- speed rail network, which increases the demand for rail capacity in the Corridor. The issue of rail line capacity, or ability of a rail line to handle daily train volume with minimum delay, is a fundamental consideration regarding the potential implementation any rail service. In the East Bay, potential Dumbarton Corridor trains going to and from a terminus adjacent to the Union City BART station would touch on three UP lines: the Coast Subdivision (between Oakland and San Jose via North Elmhurst and Newark), the Niles Subdivision (between Oakland and Newark via Niles Junction), and the Oakland Subdivision (between Oakland, Union City Niles Junction, and Stockton). The 2016 Alameda County Goods Movement Plan looked at anticipated 2020 average daily trains (freight and passenger) and the capacity of the lines above measured in terms of trains per day. The area of potential capacity concern for Dumbarton Corridor trains is with regard to crossing the UP Coast Subdivision at Newark to reach the Niles Subdivision running east to Niles (see Figure 1-4). This crossing is already at or near capacity and Dumbarton Corridor trains would need a new connection between the Niles Subdivision east of the Fremont Centerville Station and the Oakland Subdivision running north to Union City. Additional detail about existing and future conditions can be found in Chapter 4. 6.1.D. - Page 16