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Choose a Page:*Which were the biggest locomotives...*Who built the first locomotives?What were the first railways used for?What is the record speed for a train?What was the biggest gun train eve...When was the first underground rai...Which is the world's largest under...What does 'gauge' mean on railways?What is a monorail?How does streamlining speed up trains?Are steam trains still being built?What is the fastest train in use t...Which are the longest rail and met...What sort of motors power today's ... Which were the biggest locomotives ever built? The world's biggest locomotives were 534-ton steam locomotives, nicknamed 'Big Boys'. Built for the Union Pacific Railroad in the early 1940s, they hauled 70-car freight trains, weighing 3,000 tons, at speeds of up to 80 mph (129 kph). 'Big Boy' locomotives were built to haul heavy freight trains over the Rocky Mountains.   Previous: Back Book: 1001 Section: Science and Technology Chapter: Railways