Union Pacific No.4014 is a Big Boy class steam locomotive having a 4-8-8-4 wheel arrangement. They are the heaviest single expansion steam locomotive ever built, weighing about 1,200,000 pounds.
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The Fairy Queen is the oldest running train in the world. As the Guinness Book of Records documented, the Fairy Queen in India is the steam locomotive with the oldest running history worldwide.
The Big Boy has the longest engine body of any reciprocating steam locomotive, longer than two 40-foot buses. They were also the heaviest reciprocating steam locomotives ever built; the combined weight of the 772,250 lb (350,290 kg) engine and 436,500 lb (198,000 kg) tender outweighed a Boeing 747.
American freight trains are often long, heavy, and drive slowly. So, American diesel locomotives are build for that kind of work. That means they have to be heavy to be able to deliver the tractive effort to pull such trains. Otherwise the wheels would slip on the tracks.
One of the most beautiful steam locomotives ever built, the S1 was designed by Raymond Loewe. Poor balancing caused wheel-spin and only one was ever built, for the Pennsylvania Railroad in 1939.
The last meter-gauge and narrow-gauge steam locomotives in regular service were retired in 2000. After being withdrawn from service, most steam locomotives were scrapped, though some have been preserved in various railway museums. The only steam locomotives remaining in regular service are on India's heritage lines.
Twenty-five Big Boys were built exclusively for Union Pacific Railroad, the first of which was delivered in 1941. Of the eight remaining Big Boys in existence, No.4014 is the only one operating today. The Big Boys were about 133 feet long and weigh 1.2 million pounds.