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Articulated locomotives can be indicated by bracketing the front power unit — for example, the Union Pacific Big Boy, 4-8-8-4 in Whyte notation, is (2′D)D2′ in UIC notation. Plus sign "+" The locomotive or multiple unit consists of permanently coupled but mechanically separate traction units.
In rail transport, a wheel arrangement or wheel configuration is a system of classifying the way in which wheels are distributed under a locomotive. [1] Several notations exist to describe the wheel assemblies of a locomotive by type, position, and connections, with the adopted notations varying by country.
The equivalent UIC classification is refined to (2′D)D2′ for simple articulated locomotives. A similar wheel arrangement exists for Garratt locomotives, but is referred to as 4-8-0+0-8-4 since both engine units swivel. 4-8-8-4 Big Boys were only produced for the Union Pacific Railroad. Twenty-five such engines were built between 1941 and ...
Each end of the double-ended locomotive has a four-wheel truck to guide the locomotive at speed, giving the R1 a 4-8-4 wheel arrangement in the Whyte notation (AAR: 2-D-2; UIC: 2'Do2'). Besides the R1, the PRR did not build or order any other 4-8-4 locomotives, however the T1 duplex was essentially a 4-8-4 with two sets of driving wheels as a 4 ...
The Little Joe is a type of railroad electric locomotive built by General Electric. [1] The locomotives had twelve axles, eight of them powered, in a 2-D+D-2 arrangement. They were originally intended to be exported to the Soviet Union and designed to operate on Soviet Railways (SZhD) 3,300-volt DC overhead line system.
Locomotives of the 2-D+D-2 wheel arrangement in UIC classification. Pages in category "2-D+D-2 locomotives" The following 3 pages are in this category, out of 3 total.
Thus, a Union Pacific Big Boy is a 4-8-8-4: four leading wheels, one group of eight driving wheels, another group of eight driving wheels, and then four trailing wheels. Sometimes articulated locomotives of this type are denoted with a “+” between each driving wheels set (so in the previous case, the Big Boy would be a 4-8+8-4).
Locomotives classified 2′D2′ under the UIC classification of locomotive axle arrangements. The equivalent Whyte notation of locomotive axle arrangements is 4-8-4 . Subcategories