In the 1940s, American railroads were the backbone of the nation. Steam locomotives dominated the tracks — massive machines built from steel, iron, and brass. They burned coal or oil in a firebox to heat water in a giant boiler, creating high-pressure steam that drove pistons connected to large driving wheels. The result was raw, mechanical power on an enormous scale. A working steam engine was hard to ignore: thick smoke rose from the smokestack, steam hissed from valves, and a deep whistle carried for miles. The rhythmic chuffing sound grew faster as the engine gained speed.
Companies like Baldwin, Alco, and Lima built steam locomotives in many sizes for different jobs. Heavy freight engines hauled coal, ore, lumber, and manufactured goods across mountains and plains, relying on many large driving wheels for grip and pulling power. Faster, lighter passenger engines were designed to move people quickly between cities. Smaller switching locomotives maneuvered cars around busy rail yards. Each type had a specific role, and railroads ordered them accordingly.
World War II put the entire railroad system under intense pressure. Locomotives ran around the clock moving millions of troops to training camps and ports. Freight trains carried tanks, artillery, ammunition, and raw materials like steel and coal from factories to where they were needed most. The railroads never stopped — the war effort depended on them.
The men who kept these machines running worked long, demanding shifts in roundhouses and repair shops. Veteran workers like William London — 25 years on the railroad — maintained the locomotives that kept wartime freight moving. The roundhouse was where engines came in for fuel, water, and repairs before heading back out onto the main line.
Inside the shops, repairs were done with basic tools — hammers, wrenches, and muscle. The blacksmith’s craft was still very much alive in these wartime facilities, shaping and forging metal parts that kept locomotives on the rails.
The Santa Fe Railroad was one of the most important lines in the country, connecting Chicago to California. Its shops in Topeka, Kansas, and Albuquerque, New Mexico, serviced both steam and diesel locomotives. At Argentine, Kansas, workers washed 5,400-horsepower diesel freight locomotives — machines that represented the future of railroading. Out on the line, Santa Fe freights navigated long sidings and mountain passes like Cajon Pass in the San Bernardino Mountains.
Diesel locomotives were appearing more frequently in 1943, particularly for switching work at large urban freight depots. At the South Water Street terminal in Chicago, a New York Central diesel switch engine moved freight cars with a precision that steam engines found difficult in tight yard spaces. Diesel-electric locomotives used a diesel engine to power a generator, which then sent electricity to motors on each axle — a fundamentally different system from the steam piston.
With so many men away at war, women and workers who had previously been excluded from railroad jobs filled critical roles. At the Rock Island Railroad roundhouse in Blue Island, Illinois, Thomas Madrigal greased locomotives to keep them running. At the Chicago & North Western roundhouse in Clinton, Iowa, women worked as wipers — cleaning and maintaining the giant H-class locomotives. Marcella Hart, a mother of three, was among them. Viola Sievers used live steam to clean the exterior of the massive engines. These workers kept trains moving through some of the busiest years in American railroad history.
Large classification yards like the Bensenville yard of the Chicago, Milwaukee, St. Paul and Pacific Railroad handled the constant sorting and movement of freight cars feeding the war economy. Track repair and roundhouse maintenance went on continuously, keeping the infrastructure capable of handling the enormous wartime volume.
