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The triple bar character in Unicode is code point U+2261 ≡ IDENTICAL TO (≡, ≡). [1] The closely related code point U+2262 ≢ NOT IDENTICAL TO (≢, ≢) is the same symbol with a slash through it, indicating the negation of its mathematical meaning.
The first 2-6-6-4s built in the United States were for the Pittsburgh and West Virginia Railroad, and these were not high-speed locomotives but rather mountain engines. They received three in 1934 and four more in 1937 and operated the 2-6-6-4s until 1953. The next of the type was a class of ten ordered by the Seaboard Air Line in 1935 and 1937 ...
Factor of adh. The Union Pacific Challengers are a type of simple articulated 4-6-6-4 steam locomotive built by American Locomotive Company (ALCO) from 1936 to 1944 and operated by the Union Pacific Railroad until the late 1950s. A total of 105 Challengers were built in five classes. They were nearly 122 ft (37 m) long and weighed 537 short ...
UN 2208. 5.1. Calcium hypochlorite mixtures, dry, with more than 10 percent but not more than 39 percent available chlorine. UN 2209. 8. Formaldehyde, solutions, with not less than 25 percent formaldehyde. UN 2210. 4.2. Maneb or Maneb preparations with not less than 60 percent maneb.
Wikimedia Commons has media related to 2-6-4 locomotives. Locomotives classified 2-6-4 under the Whyte notation of locomotive axle arrangements. The equivalent UIC classification of locomotive axle arrangements is 1C2 or 1'C2'.
The Lionel Corporation used the 2-6-4 wheel arrangement in many of its model steam locomotives, including the 2037 used in the infamous pastel-coloured Girls' Train. [9] Their 2-6-4 model was based on the Pennsylvania Railroad’s K4 class pacific , even though this was a 4-6-2 rather than a 2-6-4.
The Union Pacific 9000 class was the only class of steam locomotives with a 4-12-2 wheel arrangement ever to be built. Under the Whyte notation for the classification of steam locomotives, the locomotives had four leading wheels, twelve coupled driving wheels, and two trailing wheels. As the Union Pacific was the only operator of this wheel ...
The U class design drew from experience with the GWR 4300s and N classes, improved by applying Midland Railway ideas to the design, enabling the SECR to influence development of the 2-6-0 in Britain. [3] The U class was designed in the mid-1920s for production at a time when more obsolete 4-4-0 locomotives were withdrawn, and derived from ...