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Altamont Corridor Express (ACE)

Stockton, CA


San Joaquin Regional Rail Commission



  • Rail Transit Maintenance
  • Passenger Rail Operations

Operations & Maintenance


Year Started
Year Completed
Delivery Method
Project Elements
  • Commuter rail


In April 1998, Herzog was awarded the contract for the startup, implementation, management, and operations of the Altamont Corridor Express (ACE). To date, Herzog remains responsible for the management, operations, and maintenance-of-equipment for ACE service on an 85-mile corridor between Stockton and San Jose, CA. The corridor has multiple users including the Union Pacific (UP), Amtrak and the Joint Powers Board (JPB) Caltrain Service.

The ACE commuter system operates eight-weekday trains over four subdivisions of UP and JPB-owned right-of-way serving 10 stations. The ACE service has experienced tremendous success, with ridership already exceeding capacity and a first-year farebox recovery ratio of close to 40%.

The commuter rail operation is governed by the General Code of Operating Rules under UP Operating and Safety Rules with trains dispatched by UP from its Harriman Center in Omaha, Nebraska.