The Centennials were the largest diesel-electric locomotives ever built.
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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.
Thirteen DDA40Xs survive today. The following list details the surviving locomotives and their current owners. 6900 - Kenefick Park, Omaha, Nebraska. The first DDA40X built, it was moved to its current location on April 15, 2005.
Currently, the most powerful diesel locomotive is the EMD DDA40X. This was essentially two GP40 type locomotives built on one frame, with a single cab, and massive 4 axle trucks. It had a roughly 6,600 HP rating.
Alco PA LocomotivesArguably the most beautiful diesel locomotive ever built, sadly no Alco PAs were originally preserved. Today, one is under restoration.
Puffing Billy is the world's oldest surviving steam locomotive, constructed in 1813–1814 by colliery viewer William Hedley, enginewright Jonathan Forster and blacksmith Timothy Hackworth for Christopher Blackett, the owner of Wylam Colliery near Newcastle upon Tyne, in the United Kingdom.
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.
Of the eighteen built, three survive and are on display in Minnesota: No. 225 at Proctor, No. 227 at the Lake Superior Railroad Museum in Duluth and No. 229 at Two Harbors.
The Big Boys were built for power. They did the work of three smaller engines, pulling 120-car, 3800 ton freight trains at forty miles per hour in the mountains of Utah and Wyoming. With power, though, comes weight - larger cylinders, pistons, drive rods, boiler and firebox.
Weighing in at 1.1 million pounds and measuring nearly half a football field in length, the “Big Boy” locomotives were designed to haul heavy freight for the Union Pacific railroad over the mountainous regions of Utah and Wyoming.
The Union Pacific Railroad (reporting marks UP, UPP, UPY) is a Class I freight-hauling railroad that operates 8,300 locomotives over 32,200 miles (51,800 km) routes in 23 U.S. states west of Chicago and New Orleans.
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. Because of their great length, the frames of the Big Boys are “hinged,” or articulated, to allow them to negotiate curves.
At 250 miles per hour, a rider using the high-speed service would travel from Vancouver to Portland in under two hours. A rider could travel from Seattle to Portland in under an hour. The top speed of 250 mph for the project is faster than other rail services on the horizon in North America.
Power plant capacity is far greater than any individual locomotive uses, so electric locomotives can have a higher power output than diesel locomotives and they can produce even higher short-term surge power for fast acceleration.