The GE 44-Tonner is an iconic diesel-electric switching locomotive built by General Electric between 1940 and 1956, with nearly 400 units produced. The locomotive was engineered to exploit a specific labor agreement: the 1937 union rule that mandated a fireman on any locomotive weighing 90,000 lbs (45 short tons) or more. By keeping the total weight just under the threshold at 44 short tons (approx. 88,000 lbs / 40 metric tons), GE enabled cost-effective single-person crew operation, making it an instant favorite for industrial facilities, branch lines, and switching yards.
 
Technical Highlights
Center-Cab Layout: Delivers clear, 360-degree visibility in both directions, ideal for tight industrial trackage and yard switching.
Dual-Prime-Mover Design: Powered by two independent industrial diesel engines—predominantly Caterpillar D17000 (V8) or D342 units—producing a combined 380 to 400 hp.
Electric Transmission: Each engine drives its own dedicated main generator, powering nose-suspended traction motors across a B-B wheel arrangement (all four axles powered).
Wide Gauge Adaptability: Delivered in standard gauge (4 ft 8½ in), narrow gauge (meter gauge), and broad gauge (5 ft 3 in), seeing extensive service across North America and abroad—including notable fleets in Brazil (Sorocabana, Mogiana, and various industrial operations).
 
With reliable GE electrical gear, straightforward mechanical systems, and low operating costs, the 44-Tonner remains a definitive milestone in the steam-to-diesel transition for switching power.