How long of a train could a big boy pull?

Theoretically, the Big Boy could pull a train 5.5 miles (8.9 km) long on flat ground from a standing start. In practice, the engine routinely pulled over 100 cars. During World War II, the Big Boys spent most of their time moving freight between Ogden and Green River.



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The world's longest and heaviest train operated on June 21, 2001, between Newman and Port Headland in Western Australia. The train operated 170 miles (274 km) with 682 loaded iron ore cars.

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The heaviest train ever hauled by a single engine is believed to be one of 15,545 tonnes (34,270,820 lb.) made up of 250 freight cars stretching 2.5 km. (1.6 miles) by the Matt H. Shay (No.

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All of the Big Boys were coal-burning, stoker-fired, designed to run 7,000 horsepower at 70 miles per hour. They have been lauded in the industry as the highest horsepower, heaviest, and longest steam locomotives ever built.

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CSX #8888, an SD40-2, ran away under power without a crew after the engineer incorrectly set the locomotive's dynamic brake and was unable to get back into the locomotive after it began moving.

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If the diesel engine referenced is the modern diesel electric locomotive that has been accompanying 4014 in its travels, my understanding is that Union Pacific utilizes it to assist with overall fuel efficiency and to provide regenerative braking. This helps with operating costs and provides a better level of safety.

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Jim Wrinn was quoted in USA Today as estimating the cost to restore the 4014 at roughly $4 million. If I remember correctly, Stephen Lee was the engineer on the 844 trip.

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Twenty-five Big Boy locomotives were built for Union Pacific to haul freight over the steep grade of the Wasatch Mountain Range in Utah during World War II. Eight were preserved after the locomotive was retired six decades ago, but only Big Boy No. 4014 is still in operation.

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Its girth requires a 4-8-8-4 wheel configuration to keep it rock-steady on the rails. With a puny 7,000 horsepower, Big Boys had a maximum tractive power of 135,375 pounds, all to pull huge loads of freight across steep grades in Utah's Wasatch Mountains and the Rockies.

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The Centennials were the largest diesel-electric locomotives ever built. Actually comprising two engines on one frame, they delivered 6,600 horsepower. Designed and built exclusively for Union Pacific Railroad, the units were named in honor of the railroad's centennial anniversary celebration in 1969.

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While most Shinkansen currently operate at a maximum of 300 kph (186 mph), the E5 “Bullet Trains” of Japan Railways East (JR East) run at up to 320 kph (200 mph) on the Tohoku Shinkansen, which runs north from Tokyo to Shin-Aomori.

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As far as I'm aware, there's no legal limit. Passenger trains do not normally exceed 12 cars (around 900 feet, dependent on rolling stock type), but many are much shorter than this.

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