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There is a book called The Big Legacy of the Union Pacific Big Boy: Why Railfans Still Love the "World's Largest" Steam Locomotive, which discusses the eight surviving examples, including No. 4012.

In 1968, Railway magazine wrote, "Preeminent is one of the Union Pacific "Big Boys" — the most powerful locomotives ever built in the United States. No. 4012 is a massive 4-8-8-4 built in 1941 and in service just in time to assist with hauling wartime loads over the Wahsatch Range of the Rockies between Utah and Wyoming. Standing by it, one can readily believe that it is the heaviest and largest locomotive ever built."

In 1957, Midwest Railroader wrote, "Union Pacific "Big Boy" was in town today, Sept. 3, Thursday. No. 4012, dead of course, stopped in NKP East Haven yards for servicing, enroute to Steamtown, Bellows Falls, Vt. It looked beautiful in a new paint job."

In 2005, the magazine Railroad History wrote, "Other images of interest, for instance, depict the LV's role in moving Union Pacific Big Boy 4-8-8-4 steam engine No. 4012 to Steamtown in Bellows Falls, Vt."

The 2006 book Steam Trains has a section about this locomotive, which begins, "1940 Union Pacific No. 4012, Alco 4-8-8-4 The steam locomotive grew ever larger even as diesel engines were starting to make inroads. It reached gargantuan proportions with the Union Pacific Railroad's legendary "Big Boys." Only 25 Big Boy engines were built, but they were monsters. Each weighed one million, two hundred thousand pounds. They stretched nearly to the 50-yard line of a football field. The 4-8-8-4 locomotives were actually two engines in one. Behind the cowcatcher and pilot wheels was a massive pair of cylinders and side rods powering eight driving wheels. Right behind the first set of drivers was another matching pair of big cylinders and eight more driving wheels. A trailing truck supported the cavernous coal-burning firebox and cab. Attached to the Big Boy was a 14-wheeled "centipede" tender that held 56,000 lbs. of coal and 25,000 gallons of water. Built by Alco, these behemoths were designed to pull 150 car freights through the Wyoming-Utah Wasatch Mountains without helper engines. This was something that the Big Boys did with ease."

Anna Dubrovsky's 2011 book Pennsylvania says "It's home to one of eight surviving “Big Boy" steam locomotives and the only one stored east of Wisconsin. Weighing in at 1.2 million pounds, Union Pacific No. 4012 was one of 25 Big Boys built in the 1940s to pull long freight trains over the mountains of Utah and Wyoming. Though it no longer operates, it's among the standouts in the collection of locomotives, passenger cars, freight cars, and maintenance-of-way equipment at Steamtown "

These references over half a century show that this specific locomotive is notable.