page_title: Altamont Corridor Express
section_title: Route
hierarchical_section_title: Altamont Corridor Express / Service / Route
caption_attribution_description: Čeština&#x202f;&#x3a;&#32; Spoj Altamont Commuter Express na trase mezi Fremontem a San José v Kalifornii. V čele vlaku lokomotiva EMD F40PHDeutsch&#x3a;&#32; Der Altamont Commuter Express durchquert das Don Edwards San Francisco Bay National Wildlife Refuge, zwischen Fremont und San Jose. Der Zug besteht aus Bombardier Bi-Level VI-Wagen inkl. Steuerwagen, und wird von einer EMD F40PH gezogen.English&#x3a;&#32; Altamont Commuter Express crossing the Don Edwards San Francisco Bay National Wildlife Refuge, between Fremont and San Jose. The train is hauled by an MPI F40PH-2C (a variant of the EMD F40PH) and consists of Bombardier Bi-Level VI coaches, including a cab car.Français&#x202f;&#x3a;&#32; L'Altamont Commuter Express traversant le Don Edwards San Francisco Bay National Wildlife Refuge, entre Fremont et San José en Californie. Le train est composée d'une locomotive MPI F40PH-3C (une variante du modèle EMD F40PH) et de wagons Bombardier Bi-Level VI.Română&#x202f;&#x3a;&#32; Trenul rapid pentru navetiști Altamont Commuter Express traversând Refugiul Național al Faunei Sălbatice Don Edwards din Golful San Francisco, între Fremont și San Jose în SUA. Trenul constă într-o locomotivă EMD F40PH care tractează vagoane de călători cu etaj Bombardier BiLevel VI, inclusiv un vagon pilot.
context_page_description: The Altamont Corridor 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. Service is managed by the San Joaquin Regional Rail Commission, and operations are contracted to Herzog Transit Services, using AAR assigned reporting mark ACEX. The 86-mile route includes ten stops, with travel time about 2 hours and 12 minutes end-to-end. The tracks are owned by Union Pacific Railroad, previously built along the Western Pacific Railroad main line. ACE uses Bombardier BiLevel Coaches and MPI F40PH-3C 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, average weekday ridership is 5,900. 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.
context_section_description: From San Jose to just north of Santa Clara, ACE uses the Caltrain main line (Peninsula Subdivision), shared with Caltrain and Amtrak service. From Santa Clara to Stockton - the majority of the route - ACE runs on Union Pacific Railroad freight lines. From Santa Clara to Newark, ACE uses the Coast Subdivision, then the Niles Subdivision to Niles. From Niles to Lathrop, the line uses the Oakland Subdivision. From Lathrop to Stockton, the line uses the Fresno Subdivision.
  The route runs through Niles Canyon, parallel to the Niles Canyon Railway, Highway 84, and the Hetch Hetchy Aqueduct. The line passes through a 0.75-mile (1.21 km) long tunnel which cuts off one of the canyon's horseshoes. This tunnel was modified from its original configuration to accommodate intermodal double-stack freight trains. However, this left the track in poor condition, reducing speeds from 45 mph (72 km/h) to 25 mph (40 km/h) in the summer and as low as 10 mph (16 km/h) during the rainy season.  The San Joaquin Regional Rail Commission plans to rehabilitate the tunnel.
  East of Pleasanton and Livermore, the line runs through the Altamont Pass on the original Feather River Route. After crossing the California Aqueduct and the Delta-Mendota Canal into the Central Valley, skirting the southern edge of Tracy. It then turns north between Lathrop and Manteca and runs to Robert J. Cabral Station in Stockton.
caption: Altamont Corridor Express train crossing the San Francisco Bay National Wildlife Refuge between Fremont and San Jose
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