GE U34CH

The GE U34CH was a diesel-electric passenger locomotive built by General Electric beginning in 1970, with 32 units constructed for the New Jersey Department of Transportation and placed into commuter service on the Erie Lackawanna Railway out of Hoboken, New Jersey. Numbered 3351 through 3382, the locomotives were paired with new Pullman Standard push-pull coaches and assigned to suburban commuter runs that the NJDOT sought to modernize. Finished in a distinctive dark blue and silver livery bearing the NJDOT logo, the locomotives quickly earned the nickname "Bluebirds" among rail enthusiasts. On weekends, when commuter demand was reduced, the units occasionally found themselves pressed into Erie Lackawanna freight service, returning to passenger duty by Monday morning. When the bankrupt Erie Lackawanna was absorbed into Conrail on April 1, 1976, the U34CHs were renumbered 4151 through 4182 and continued operating over the same former EL corridors into Hoboken. One unit, originally numbered 3351, had been damaged in a 1974 wreck and was rebuilt at GE's Cleveland facility, returning in a Bicentennial paint scheme lettered for Conrail and carrying the number 1776 before eventually being renumbered 4151. In 1978, a 33rd locomotive was added to the fleet when the New York MTA took delivery of a U34CH rebuilt from an accident-damaged former Chicago and North Western Railway GE U30C. This unit, numbered 4183, was painted in the familiar Bluebird scheme with an MTA nose logo and operated in connection with Port Jervis service. When New Jersey Transit assumed commuter rail operations on January 1, 1983, the NJDOT-owned locomotives transferred to the new agency, most retaining their Bluebird paint with only minor markings changes, while seven units received NJ Transit's Disco Stripe livery. By the early 1990s the U34CH fleet had aged considerably, and as New Jersey Transit received rebuilt GP40PH-2 locomotives from Conrail's Juniata shops between 1993 and 1994, the units were withdrawn from service rather than repaired when major mechanical failures occurred. The fleet was formally retired from passenger service in August 1994. A small number were subsequently leased to SEPTA and others were sold to Conrail, which eventually transferred nineteen units to GEC-Alstom for shipment to Mexico, where at least five were known to remain operational into the early 2000s. Nine units were scrapped outright, and one was sold to América Latina Logística of Brazil for parts. All U34CHs had departed NJ Transit property by 1996. One example, number 4172, was donated to the United Railway Historical Society of New Jersey and has been undergoing cosmetic and mechanical restoration at a facility in Boonton, New Jersey, with cosmetic work completed by September 2023.

The U34CH was powered by GE's FDL-16 prime mover, a sixteen-cylinder turbocharged diesel engine capable of producing 3,600 horsepower at its standard operating speed of 1,050 RPM. The locomotive rode on a B-B wheel arrangement and employed DC traction motors. Among its most significant engineering distinctions was its shaft-driven head-end power system, in which an HEP alternator was driven directly by the prime mover rather than by a separate auxiliary diesel engine, making the U34CH one of the earliest commuter locomotives to employ this configuration. To maintain the correct alternating current frequency for passenger car electrical systems, the FDL-16 was held at a constant 900 RPM when supplying head-end power, which reduced the power available for traction to approximately 3,430 horsepower under those conditions. When operating in freight service without HEP demands, the engine could return to 1,050 RPM and deliver its full 3,600 horsepower to the traction motors. The U34CH was also notable as the first GE locomotive to employ steel crowned pistons as part of its effort to reach the 3,600 horsepower rating, representing an incremental advance in the development of the FDL engine series. The model occupied an interesting position in GE's product lineup, appearing in the catalog before the U36C despite sharing a closely related mechanical foundation with that freight locomotive. Its combination of shaft-driven HEP, high output, and B-B truck configuration made it a specialized design tailored specifically to the demands of high-frequency commuter service, and it served as an important reference point in the broader evolution of dedicated passenger locomotive technology in North America.

—