Diagrammatic representation of the wheels of a type 2-7-2 locomotive
Type 2-7-2 is a locomotive with two slider axles , seven moving axes in one rigid frame and with two supporting axes .
Recording methods for different classifications:
- International (UIC): 2G2
- American : 4-14-4
- Spanish and French: 272
- Russian: 2-7-2
- Swiss: 7/11
Examples of locomotives
In the history of locomotive construction, only one locomotive with seven moving axles in one frame is known - the Soviet locomotive AA20-01 ( AA - Andrey Andreyev ; 20 - the load from the driving axles on the rails, in tons). This locomotive was built in 1934 at the Voroshilovgrad Locomotive Plant in a single copy. In 1935, the locomotive made several experimental trips, during which it became clear that its harmful effects on the road. In the same year, the engine was suspended from train work.