The Altamont Corridor Express (also known as Altamont Commuter Express or ACE) provides commuter rail service between Stockton and San Jose. ACE uses diesel locomotive hauled Bombardier bi-level trains with 110 volt AC outlets, a bike car, and restrooms in every car. ACE operates 4 round trips during weekday peak hours only (4 AM trips to San Jose, 4 PM trips to Stockton).
By the numbers
- Route length: 85 miles
- Daily ridership: ~ 2,500 passengers/day (2005)
- Average passenger trip length: 48 miles (computed from NTD2004)
- 10 rail stations in 3 counties: San Joaquin, Alameda, and Santa Clara.
- 4 round trips on weekdays between Stockton and San Jose.
» ACEforward – various projects to increase track capacity between Stockton and San Jose
» ACE eastward extension from Lathrop t0 Modesto, Turlock, and Merced
» ACE northward extension from Stockton to Sacramento
» Rail connection between ACE and BART in the Tri-Valley
ACE is managed by the San Joaquin Regional Rail Commission (SJRRC). They contract with Herzog Transit Services Inc. to operate the trains.
- 1989: San Joaquin Council of Governments, Stockton Chamber of Commerce, and the Building Industry Association of the Delta begin developing a 20-year transportation plan. 1990: San Joaquin County Measure K half-cent sales tax for transportation passes.
- 1995: County of San Joaquin forms a joint powers agreement that creates the San Joaquin Regional Rail Commission to implement the rail plan.
- May 1997: Agreement between the San Joaquin Regional Rail Commission, Alameda Congestion Management Agency, and the Santa Clara Valley Transportation Authority to create the ACE Joint Powers Authority.
- October 19, 1998: First day of ACE operations with 4 daily weekday trains — 2 westbound trains in the morning and 2 eastbound trains in the evening — operated by Herzog Transit Services, Inc. under contract with the San Joaquin Regional Rail Commission.
- February 2000: ACE adds a morning turn-back train between San Jose and Fremont.
- March 5, 2001: To alleviate overcrowding, ACE drops the turn-back train and adds a third round trip that departs Lathrop-Manteca later in the morning and returns in the evening, for a total of 3 westbound morning trains and 3 eastbound evening trains. It also begins stopping at the Santa Clara Caltrain station near downtown Santa Clara.
- August 1, 2005: ACE suspends service at Santa Clara Caltrain station.
- August 28, 2006: ACE adds a fourth round-trip between Stockton and San Jose, providing mid-day weekday service
- November 2, 2009: ACE discontinues mid-day round-trip.
- May 2012: ACE restores service at Santa Clara Caltrain station.
- October 2012: ACE adds a fourth round-trip during peak hours.
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- Why does BART use wider, non-standard guage rails?
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- Why is Caltrain electrification so important?