Amtrak has a number of converted Metroliner EMUs in service as cab cars on the Keystone Corridor, where they operate in conjunction with ACS-64 electric locomotives. In addition, many regional services, such as the Michigan Services and "Cascades", are operated with Non-Powered Control Units - EMD F40PH locomotives converted to use as a cab control and baggage car, earning itself the nickname 'cabbage cars'. Similarly, the "Capitol Corridor", "San Joaquin", and "Pacific Surfliner" services in California are operated in push–pull configuration using purpose-built cab cars and diesel locomotives.