Fairbanks-Morse H-24-66

Fairbanks-Morse H-24-66 The Fairbanks-Morse H-24-66 was a heavy road locomotive built by Fairbanks-Morse in the early 1950s, intended to compete with models from Electro-Motive Division, Alco, and General Electric. Designed for mainline freight service, it combined a powerful opposed-piston diesel prime mover with a C-C wheel arrangement to provide high tractive effort for heavy trains on routes operated by carriers such as Pennsylvania Railroad, New York Central Railroad, and Baltimore and Ohio Railroad. Despite ambitious goals, limited production and operational challenges affected its adoption by major railroads including Illinois Central Railroad and Southern Pacific Railroad.

Design and Specifications

The H-24-66 employed a 24-cylinder, 38D 8-1/8 opposed-piston prime mover derived from Fairbanks-Morse marine engines used by United States Navy vessels and informed by work for Liberty ship auxiliaries, featuring air-starting systems and direct-drive crankcases patterned after marine practice. The locomotive’s C-C wheel arrangement used three-axle trucks similar to those on contemporary GE U25B competitors, with Westinghouse electrical components analogous to systems supplied to Baldwin-Lima-Hamilton units; traction motors and generator matched to produce 4,400 horsepower for heavy freight and helper service on grades like those on the Sierra Nevada and Allegheny Mountains. The carbody combined heavy plate construction and roof-mounted intakes that echoed styling cues from EMD F-series and ALCO PA aesthetics, while its control stand incorporated features familiar to crews from Pennsylvania Railroad and New York Central practice.

Production and Variants

Production runs were extremely limited, with approximately a dozen examples built for demonstration and specific orders, reflecting Fairbanks-Morse’s pivot from stationary and marine markets to mainline locomotive building at its plants in Cleveland, Ohio and Erie, Pennsylvania. Variants explored different gearing ratios, auxiliary equipment, and carbody treatments to suit potential buyers including Union Pacific Railroad, Atchison, Topeka and Santa Fe Railway, and Canadian National Railway, but most modifications remained experimental after trade discussions with representatives from Association of American Railroads and procurement officers from Southern Railway failed to yield large contracts. Prototype testing involved runs on lines owned by New York, New Haven and Hartford Railroad and demonstrations on Penn Central corridors, but few units entered long-term roster service.

Service History

In service trials the H-24-66 operated on mainlines of Baltimore and Ohio Railroad, Illinois Central, and smaller regional carriers, performing helper and road freight duties on mountainous divisions such as the Cascade Range and Appalachians, where reliability and fuel consumption were closely monitored by superintendent offices from Missouri Pacific Railroad and Chesapeake and Ohio Railway. Crews compared the H-24-66 to contemporaries like the EMD SD24 and Alco Century 628, noting differences in starting characteristics and braking integration with Air Brake Association-standard systems used by New York Central. Maintenance logs from several roads reported repeated prime mover overhauls similar to issues encountered in marine conversions for United States Coast Guard vessels, leading many carriers to favour the more established Electro-Motive Division offerings.

Technical Performance and Maintenance

The opposed-piston 38D engine delivered high specific power and compact dimensions but required specialized knowledge for valve and piston maintenance, tasks previously more common in naval engineering workshops for World War II ship engines; maintenance intervals were often shorter than for two-stroke diesel designs used by EMD and newer four-stroke units from ALCO. Fuel efficiency during heavy-duty runs was competitive on paper with units used by Union Pacific, yet real-world thermal management, turbocharger servicing, and crankcase ventilation demanded parts and tooling more typically stocked by shipyard facilities and marine suppliers, prompting several railroads to reassign H-24-66 units to lesser duties or return them to manufacturer support depots in Cleveland and Erie. Electrical system faults involved components from vendors also supplying General Electric and Westinghouse traction equipment, and required coordination with regional shops overseen by railroad mechanical departments such as those of Southern Pacific and Baltimore and Ohio.

Surviving Examples and Preservation

A very small number of H-24-66s survive in museums and on heritage railways, with preservation efforts often led by organizations like the Railway and Locomotive Historical Society, the National Railroad Museum, and local railroad historical groups associated with former Pennsylvania Railroad lines. Preserved units are displayed in collections focusing on diesel evolution alongside examples from EMD, ALCO, and GE; restoration campaigns frequently involve partnerships with technical schools, municipal museums, and volunteers from societies such as the Steam Railroading Institute to source parts and restore electrical and prime mover systems. Events featuring operational demonstrations have been hosted at venues including the Railfair exhibitions and anniversary gatherings organized by the HeritageRail Alliance.

Category:Diesel-electric locomotives