Altamont Corridor Express train climbing its namesake Altamont Pass
Overview
Owner
San Joaquin Regional Rail Commission
Area served
San Joaquin Valley, Tri-Valley and Silicon Valley
Transit type
Commuter rail
Number of stations
10
Daily ridership
2,500 (weekdays, Q4 2023)[1]
Annual ridership
576,300 (2023)[2]
Headquarters
Robert J. Cabral Station Stockton, California
Website
acerail.com
Operation
Began operation
October 19, 1998; 25 years ago (1998-10-19)[3]
Operator(s)
Herzog Transit Services
Reporting marks
ACEX[4]
Infrastructure manager(s)
Union Pacific (Stockton–Santa Clara) Caltrain (Santa Clara–San Jose)
Number of vehicles
10 locomotives, 30 passenger cars
Train length
1–2 locomotives, 4–8 passenger cars
Technical
System length
85 mi (137 km)
Track gauge
4 ft 8+1⁄2 in (1,435 mm) standard gauge
Average speed
39 mph (63 km/h)
Top speed
79 mph (127 km/h)
System map
Altamont Corridor Express highlighted in purple Show interactive map
Legend
Valley Rail (2026)
Amtrak Coast Starlight
to Seattle
Bus connection to
Sacramento Airport
Natomas/Sacramento Airport
Old North Sacramento (2029)
Globe (RT)
RT to Watt/I-80
Amtrak to Auburn & Chicago
American River
to Downtown Sacramento
Midtown Sacramento
()
RT to Historic Folsom
City College (2029)
RT to Cosumnes River College
Elk Grove
Sacramento County
San Joaquin County
Lodi (2027)
ACE service facility
Amtrak San Joaquins
to Sacramento
Stockton
Amtrak San Joaquins
Oakland │ Bakersfield
Altamont Corridor
Vision (2026/2030)
Altamont Corridor
Vision
North Lathrop (2027)
Manteca Transit Center
Ripon (2027)
Stanislaus R
San Joaquin Co.
Stanislaus Co.
Modesto
Tuolumne River
Ceres
layover facility
bus bridge
Phase 1 (2026)
Turlock (2029)
Phase 2 (2030)
Stanislaus County
Merced County
Merced River
Livingston
Atwater
(option)
Layover and
maintenance facility
Merced CAHSR
Lathrop/Manteca
San Joaquin River
Tracy
California Aqueduct
San Joaquin County
Alameda County
Altamont Pass through
the Diablo Range
Vasco Road
Livermore
Pleasanton
Niles Canyon
Amtrak to Oakland & Seattle
Union City
(planned)
Fremont
Amtrak (planned)
Coyote
Creek
Alameda County
Santa Clara County
VTA to Mountain View
Lick Mill (VTA)
Santa Clara–
Great America
Caltrain to San Francisco
Santa Clara
VTA to Santa Teresa
San Jose
VTA to Winchester
Caltrain to Tamien
Coast Starlight to Los Angeles
All stations are accessible
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The Altamont Corridor Express (also known as ACE, formerly Altamont Commuter Express) is a commuter rail service in California, connecting Stockton and San Jose during peak hours only. ACE is named for the Altamont Pass, through which it runs.[5] Service is managed by the San Joaquin Regional Rail Commission, and operations are contracted to Herzog Transit Services.[5] The 86-mile (138 km) route includes ten stops, with travel time about 2 hours and 12 minutes end-to-end. In 2023, the line had a ridership of 576,300, or about 2,500 per weekday as of the fourth quarter of 2023. ACE uses Bombardier BiLevel Coaches, MPI F40PH-3C locomotives, and Siemens Charger locomotives.
Service began on October 19, 1998, with two weekday round trips. A third round trip was added in May 2001, followed by a fourth round trip in October 2012. Saturday service commenced in September 2019. As of 2018[update], average weekday ridership was 5,900.[6]
The tracks are owned by Union Pacific Railroad, previously built along the Western Pacific Railroad main line. Under the ACEforward program, a number of improvements to the service are being considered. These include a rerouted line through Tracy, an extension to Modesto and Merced, and connections to BART at Union City and Tri-Valley.
^"Transit Ridership Report Fourth Quarter 2023" (PDF). American Public Transportation Association. March 4, 2024. Retrieved March 14, 2024.
^"Transit Ridership Report Fourth Quarter 2023" (PDF). American Public Transportation Association. March 4, 2024. Retrieved March 14, 2024.
^Cite error: The named reference acehistory was invoked but never defined (see the help page).
^"AAR Railroad Reporting Marks (2015)". Railserve. Retrieved June 28, 2016.
^ abSolomon, Brian (2013). North American Railroad Family Trees : An Infographic History of the Industry's Mergers and Evolution. Minneapolis, MN: Voyageur Press. p. 127. ISBN 978-0-7603-4488-0.
^"Transit Ridership Report: Second Quarter 2018" (PDF). American Public Transportation Association. August 24, 2018. Archived from the original (PDF) on October 4, 2018. Retrieved December 6, 2018.
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Global Information
Altamont Corridor Express highlighted in purple 
