GE P42DC

The GE P42DC emerged from General Electric's Genesis locomotive program as the refined successor to the earlier P40DC, entering production in 1996 and continuing through 2001. A total of 208 units were constructed to serve Amtrak's passenger rail network across the continental United States, with a smaller number going to Via Rail Canada beginning in 2001, where they replaced the troublesome LRC locomotives on the Quebec City to Windsor corridor. The P42DC represented a meaningful incremental improvement over the P40DC, offering greater horsepower and a higher top speed that better suited the demands of Amtrak's expanding intercity services. Throughout the late 1990s and into the twenty-first century, the P42DC became the workhorse of Amtrak's diesel locomotive fleet, powering long-distance trains such as the California Zephyr, the Southwest Chief, and the Empire Builder, among many others. Their reliability and relatively modern computerized systems made them the preferred motive power for trains operating outside the electrified Northeast Corridor. For many years they represented the most visible face of Amtrak's diesel operations, appearing in successive phases of the railroad's livery schemes as the fleet was periodically repainted. By the early 2020s, Amtrak began introducing the Siemens ALC-42 Charger to replace P42DCs on long-distance services, though the older units have continued to operate on shorter corridor trains. In a notable late-life development, Amtrak began converting retired P42DC locomotives into non-powered control units designated P42C beginning in 2024, with the first example entering service in 2025. This repurposing extended the mechanical legacy of the type even as new motive power gradually displaced the locomotives from front-line assignments.

The P42DC is powered by a GE FDL16 prime mover producing 4,250 horsepower at 1,047 rpm, an improvement over the 4,000 horsepower output of the P40DC it succeeded. The locomotive uses a B-B wheel arrangement with DC traction motors and is geared for a maximum operating speed of 110 miles per hour, compared to the 103 miles per hour ceiling of its predecessor. Like all Genesis series locomotives, it features a lightweight monocoque carbody designed to meet a strict height restriction of 14 feet 4 inches, enabling operation through low-clearance tunnels on the Northeast Corridor. Starting tractive effort is rated at approximately 63,000 pounds-force, with continuous tractive effort of roughly 38,000 pounds-force at 38 miles per hour. The locomotive provides head-end power through an alternator driven by the main engine, capable of delivering up to 800 kilowatts to the passenger consist, sufficient for up to 16 Superliner cars. When operating in HEP mode with engine speed locked at 900 rpm, traction output is reduced, and at maximum HEP load the available traction horsepower drops to approximately 2,525. Running gear includes trucks manufactured by Krupp Verkehrstechnik, a firm subsequently acquired by Siemens Mobility, and later production examples carry Siemens badging on their trucks accordingly.

Models by: Athearn · Kato