#2446
Soviet locomotive class AA20
🇷🇺 Soviet Union ·built by Friedrich Krupp AG· from 1934· class of one Soviet 4-14-4 locomotive
what is it?
The SZD Class AA20 was a one-off experimental 4-14-4 steam locomotive constructed in the Soviet Union by Krupp and the Voroshilovgrad Locomotive Factory in 1934 for the Sovetskie Zheleznye Dorogi (SŽD). Two locomotives were set to be built, but due to the construction of the railway's more successful and widespread FD Class, only AA20-1 was built, leaving the second AA20 incomplete.
who runs it
base stats
Bars compare against all trains: 600 km/h (maglev), 1,700 seats; power, weight and number built on a log scale up to 20 MW, 1,000 t and 20,000 built.
fun facts
- First built 92 years ago, in 1934.
- 33.7 m long: about 7 cars parked nose to tail.
- Served for 25 years (1935–1960).
steam locomotive: Burns coal, wood or oil to boil water; the steam drives pistons that turn the wheels.
spec sheet
- built
- 1934
- in service from
- 1935
- retired
- 1960
- status
- retired
- number built
- 1
- kind
- Steam
- traction
- steam
- origin
- 🇷🇺 Soviet Union
- builders
- Friedrich Krupp AG, Luhanskteplovoz
- operators
- Soviet Railways
- top speed
- 70 km/h
- power
- —
- gauge
- 1,524 mm Russian broad gauge
- wheel arrangement
- 4-14-4 (proposed as a 2-14-4)
- length
- 33.7 m
From the Wikipedia infobox and Wikidata. Blank means the sources don't say.
Sources: Wikidata Q266351, Wikipedia: Soviet locomotive class AA20 (CC BY-SA 4.0).Updated 2026-10-25.