Amtrak Cities Sprinter

Amtrak Cities Sprinter
Fan Railer · CC BY-SA 4.0 · source
Name	Amtrak Cities Sprinter
Powertype	Diesel-electric
Builder	Hunslet Engine Company
Builddate	1970
Serialnumber	HEC 7001–7004
Wheelarrangement	Bo-Bo
Length	56 ft
Enginetype	Paxman 12YHXL
Poweroutput	1,200 hp
Operator	Amtrak
Fleetnumbers	100–103
Disposition	Withdrawn, some preserved

Amtrak Cities Sprinter is a small fleet of four prototype diesel-electric locomotives built in 1970 for the National Railroad Passenger Corporation by the Hunslet Engine Company in the United Kingdom. Developed to meet early Amtrak needs for lightweight, high-speed passenger service, the units were trialed on intercity corridors alongside equipment from General Motors Electro-Motive Division, General Electric, and EMD F40PH predecessors. The Sprinters influenced later procurements and diesel-hydraulic experiments in the United States, attracting attention from transit agencies such as New Jersey Transit and operators including Baltimore and Ohio Railroad and collaborators in freight testing like Conrail.

Design and Development

The Cities Sprinter program originated from discussions between Amtrak executives and international manufacturers including British Rail Engineering Limited, Hunslet Engine Company, and English Electric. Intended as a modern lightweight alternative to heavier Penn Central and Baltimore and Ohio Railroad motive power, Hunslet produced four demonstrators leveraging experience from export markets to British Rail and South African Railways. The concept sought to combine high-speed gearing used by InterCity 125 prototypes, compact Paxman prime movers similar to those in Royal Navy auxiliary units, and crashworthiness standards being debated in committees such as the American Public Transportation Association. Prototype trials were scheduled on corridors linking New York Penn Station, Philadelphia 30th Street Station, Washington Union Station, and Midwest terminals including Chicago Union Station.

Technical Specifications

The Sprinter used a Paxman 12YHXL twelve-cylinder diesel engine rated at approximately 1,200 horsepower, coupled to a DC generator and traction motors influenced by designs from English Electric and General Electric. The Bo-Bo wheel arrangement and relatively light axle load made the units suitable for branch-lines serving stations like Providence Station and Albany–Rensselaer. The carbody incorporated aluminium alloys similar to those employed on Budd Company stainless steel rolling stock and used dynamic braking systems comparable to those on early EMD GP38 derivatives. On-board equipment included multiple-unit control consistent with GE practices, steam generator alternatives for train heating influenced by Amtrak decisions of the 1970s, and cab ergonomics inspired by British Rail prototypes. Fuel capacity, electrical output for head-end power, and gearing were tailored for intercity timetables linking Boston South Station and New Haven Union Station.

Service History

After delivery, the four units were deployed on demonstration runs across the Northeast Corridor, Midwest services to Milwaukee Intermodal Station and regional trials toward Pittsburgh Station, often running in mixed consists with Amtrak heritage coaches and testing on commuter-focused schedules similar to those later adopted by Metra and SEPTA. Performance reports circulated within Amtrak management and to state transportation departments such as the Massachusetts Department of Transportation and Pennsylvania Department of Transportation. Operational issues encountered during early service mirrored those of other contemporary experiments, prompting comparative evaluation against locomotives like the EMD F40PH and retired Alco units formerly used on named trains such as the Broadway Limited and Capitol Limited.

Variants and Modifications

Throughout their careers the Sprinters received modifications including upgraded control circuitry from vendors connected to General Electric and retrofitted heating systems to align with Amtrak standards for winter service on routes to Montreal Central Station and Montreal Windsor Station. At least one unit underwent rebuild work involving traction motor overhauls in facilities operated by Amtrak Mechanical teams and subcontractors linked to Hunslet spares networks. Experimental conversions considered auxiliary power units to supply head-end power similar to later HHP-8 proposals and alternative prime movers tested in partnership with manufacturers influenced by Paxman’s export programs to Australian National and South African Railways.

Operational Performance and Reliability

Service logs recorded mixed results: the Sprinters demonstrated efficient fuel use on light-express consists but suffered from parts obsolescence and maintenance complexity compared with domestically supported fleets from EMD and GE Transportation Systems. Reliability metrics compared unfavorably with the later standardized F40PH fleet, while ride quality and top-speed capability were praised on test runs between Baltimore Penn Station and Newark Penn Station. Their experimental status limited long-term adoption, and fleet availability was affected by supply-chain challenges tied to overseas components sourced via Hunslet and Paxman.

Preservation and Legacy

Following withdrawal from revenue service, examples of the Sprinter entered preservation at institutions including the National Railroad Museum, regional railway museums, and private preservation groups allied with organizations such as the Railway & Locomotive Historical Society and Historic Railways Trust. The program’s influence persisted in procurement dialogues that shaped later procurements involving EMD, GE, and European builders like Siemens and Alstom, and it is cited in studies by transportation agencies including Federal Railroad Administration and state departments of transportation. As a niche chapter in U.S. passenger-rail history, the Sprinter represents early Amtrak experimentation with international equipment, informing later collaboration between American and foreign manufacturers on high-speed and intercity programs such as Acela Express and successor fleets.

Category:Diesel-electric locomotives of the United States Category:Amtrak rolling stock