GE P30CH

Amtrak ordered 25 GE P30CH locomotives in 1974 as part of the national passenger railroad's early efforts to build a modern, purpose-built diesel fleet. General Electric delivered all 25 units in 1975, with each locomotive costing Amtrak approximately $480,000. The order followed Amtrak's earlier purchase of EMD SDP40Fs and represented the railroad's attempt to diversify its motive power suppliers while obtaining equipment designed specifically for passenger service. The designation P30CH encoded the locomotive's key characteristics, with "P" indicating passenger service, "30" referring to the 3,000 horsepower output, "C" denoting the six-axle C-C wheel arrangement, and "H" signifying head-end power capability. Crews and enthusiasts came to nickname the locomotives "Pooches" based on this alphanumeric designation. The P30CHs proved troublesome in service and were never well regarded by operating crews or Amtrak management. Mechanical reliability issues plagued the class throughout its career, and the six-axle configuration fell out of favor at Amtrak by the mid-1970s as the railroad came to prefer four-axle locomotives better suited to routes with frequent curves. Two units were lost to accidents before the class reached retirement, with number 713 damaged in a collision with log trucks in 1977 and number 715 destroyed in a collision with an Illinois Central freight train in 1979. In 1978, Amtrak leased fifteen of the locomotives to Southern Pacific for use on the Peninsula Commute service between San Francisco and San Jose. In their later years the surviving units found regular work on the Sunset Limited and Auto Train routes, though the arrival of the EMD F40PH quickly hastened their displacement from primary assignments. The class made its final runs in late 1991, with the last active examples retired by 1992 as the newer Dash 8-32BWH and Genesis series locomotives took over Amtrak's long-distance passenger operations.

The GE P30CH was powered by a GE FDL16 prime mover, a sixteen-cylinder version of General Electric's 7FDL diesel engine family, producing 3,000 horsepower and driving the traction motors through a direct current electrical transmission. Mechanically the design drew heavily on GE's U30C freight locomotive, adapting that platform's running gear and power plant for passenger service. The locomotive rode on a C-C wheel arrangement with six powered axles, a configuration that would ultimately contribute to its operational shortcomings on curving right-of-way. Rather than the hood unit styling of its freight ancestors, the P30CH was clothed in a full-width cowl carbody consistent with the aesthetic preferences of the passenger market and comparable to the styling used by EMD on competing passenger designs of the era. One of the most significant features of the P30CH was its head-end power system, which made it the first Amtrak diesel locomotive delivered from the factory already equipped for HEP service rather than relying on locomotive-generated steam heat or separate generator cars. The system used two Detroit Diesel generator sets, each rated at 375 kilowatts, providing a combined output of 750 kilowatts to supply electricity for heating, cooling, and lighting throughout passenger consists. This capability represented an important step in Amtrak's transition away from steam heat infrastructure, though the added complexity of the HEP equipment contributed to the maintenance difficulties that characterized the class throughout its service life.

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