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The sole example of this type, called the AA20-1, was built by the Soviet Union. The designation stands for Andrey Andreyev (who sponsored its construction), 20 ton axle load. While some builders had produced twelve-coupled (six driving axles) designs, no one had ever built a fourteen-coupled engine. The AA20-1 holds two records: the largest number of coupled axles on a locomotive, and being the longest rigid frame locomotive in Europe. It was the largest rigid frame locomotive in the world until 1939, when the PRR S1 was unveiled.[citation needed]
The large number of driving axles were meant to spread out the locomotive's weight, reducing the axle load and the resulting stress on the track. A group of Soviet locomotive engineers had visited the United States, and presumably they had seen the 4-12-2 locomotives being used by the Union Pacific. The 4-14-4 could be viewed as an expansion of that type. Unlike the successful Union Pacific locomotives, however, the AA20-1 was a complete failure.[citation needed]
The AA20-1 was originally intended to be a 2-14-4 (1'G2'). Construction was chiefly undertaken in Essen, Germany by Krupp, following a Soviet design. Later, the unfinished locomotive was moved to Lugansk, where a two-axle leading truck was fitted. The trailing trucks supported a huge firebox. The AA20-1 was intended to run on low-quality coal, so a lot of space was needed to burn it in order to provide enough heat to the boiler.[citation needed]
The seven driving axles were laid out 1.7 m (5.6 ft) apart, giving a very long rigid wheelbase of 10 m (33 ft). This required adaptations to negotiate curves. The center three driving axles were blind, and the first and seventh driving axles were fitted with lateral motion devices. These measures were not enough to make the AA20-1 work properly, however. As a result of its massive size and long wheelbase, it was too heavy and prone to frequent derailments, expanding the track and destroying points of the switches it passed over. It was too big to fit on the turntables, too powerful for the couplers in use at the time and unable to run at full power for very long due to the poor-grade coal being insufficient to provide full steam capacity for the massive boiler.[citation needed]
The AA20-1 made one publicity trip to Moscow in 1935 before being put into storage at the Shcherbinka test facility (potentially as an instructional tool) and finally scrapped in 1960, though this was not stated publicly.[citation needed]
^"AA-20". loco.skyrocket.de. Retrieved 10 December 2017.
External links
Stalin's Engine: The AA20
February 24, 2023
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This article may be expanded with text translated from the corresponding article in Russian February 2013 Click show for important translation instructions View a machine translated version of the Russian article Machine translation like DeepL or Google Translate is a useful starting point for translations but translators must revise errors as necessary and confirm that the translation is accurate rather than simply copy pasting machine translated text into the English Wikipedia Consider adding a topic to this template there are already 2 745 articles in the main category and specifying topic will aid in categorization Do not translate text that appears unreliable or low quality If possible verify the text with references provided in the foreign language article You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation A model attribution edit summary is Content in this edit is translated from the existing Russian Wikipedia article at ru AA parovoz see its history for attribution You should also add the template Translated ru AA parovoz to the talk page For more guidance see Wikipedia Translation The AA20 was a one off steam locomotive constructed by the Soviet Union under the dictatorship of Joseph Stalin Soviet locomotive class AA20A Andreev Andreyev the only 4 14 4 locomotive ever builtType and originPower typeSteamBuilderVoroshilovgrad Locomotive FactoryBuild date1934Total produced1SpecificationsConfiguration Whyte4 14 4Leading dia 760 mm 29 92 in Driver dia 1 600 mm 62 99 in Trailing dia 1 050 mm 41 34 in Length33 730 mm 110 66 ft Axle load20 t 20 long tons 22 short tons Fuel typeCoalFirebox Firegrate area12 m2 130 sq ft Boiler pressure17 kgf cm2 1 67 MPa 242 psi Superheater Heating area174 m2 1 870 sq ft CylindersTwo outsideCylinder size740 mm 810 mm 29 13 in 31 89 in bore x strokePerformance figuresMaximum speed70 km h 43 mph Tractive effort320 kN 71 940 lbf CareerOperatorsRussian RailwaysLocaleRussiaFirst run1935Scrapped1960DispositionScrapped 1 Contents 1 Wheel arrangement 2 History 3 See also 4 References 5 External linksWheel arrangement EditThe AA20 was a 4 14 4 locomotive using the Whyte notation classification of steam locomotives by wheel arrangement It featured four leading wheels fourteen coupled driving wheels seven axles in a rigid frame and four trailing wheels citation needed Equivalent classifications in other notations would have been citation needed UIC classification 2G2 also known as German classification and Italian classification French classification 272 Turkish classification 711 Swiss classification 7 11 Russian classification 2 7 2History EditThe sole example of this type called the AA20 1 was built by the Soviet Union The designation stands for Andrey Andreyev who sponsored its construction 20 ton axle load While some builders had produced twelve coupled six driving axles designs no one had ever built a fourteen coupled engine The AA20 1 holds two records the largest number of coupled axles on a locomotive and being the longest rigid frame locomotive in Europe It was the largest rigid frame locomotive in the world until 1939 when the PRR S1 was unveiled citation needed The large number of driving axles were meant to spread out the locomotive s weight reducing the axle load and the resulting stress on the track A group of Soviet locomotive engineers had visited the United States and presumably they had seen the 4 12 2 locomotives being used by the Union Pacific The 4 14 4 could be viewed as an expansion of that type Unlike the successful Union Pacific locomotives however the AA20 1 was a complete failure citation needed The AA20 1 was originally intended to be a 2 14 4 1 G2 Construction was chiefly undertaken in Essen Germany by Krupp following a Soviet design Later the unfinished locomotive was moved to Lugansk where a two axle leading truck was fitted The trailing trucks supported a huge firebox The AA20 1 was intended to run on low quality coal so a lot of space was needed to burn it in order to provide enough heat to the boiler citation needed The seven driving axles were laid out 1 7 m 5 6 ft apart giving a very long rigid wheelbase of 10 m 33 ft This required adaptations to negotiate curves The center three driving axles were blind and the first and seventh driving axles were fitted with lateral motion devices These measures were not enough to make the AA20 1 work properly however As a result of its massive size and long wheelbase it was too heavy and prone to frequent derailments expanding the track and destroying points of the switches it passed over It was too big to fit on the turntables too powerful for the couplers in use at the time and unable to run at full power for very long due to the poor grade coal being insufficient to provide full steam capacity for the massive boiler citation needed The AA20 1 made one publicity trip to Moscow in 1935 before being put into storage at the Shcherbinka test facility potentially as an instructional tool and finally scrapped in 1960 though this was not stated publicly citation needed See also EditHistory of rail transport in Russia Russian Railway Museum Saint PetersburgReferences Edit AA 20 loco skyrocket de Retrieved 10 December 2017 External links EditStalin s Engine The AA20 Retrieved from https en wikipedia org w index php title Soviet locomotive class AA20 amp oldid 1128499388, wikipedia, wiki, book, books, library,
