This is one preserved steam locomotive of the IS20 series in the whole world. This series of the steam locomotives was renamed to FD20p in 1996 after XX Congress of the Communist Party of the USSR to debunk Stalin's personality cult. Article about
https://en.wikipedia.org/wiki/Soviet_locomotive_class_IS In general IS20 steam locomotive was similar with FD20 by the construction of boiler, but they have other wheel arrangment 2-8-4 unlike to 2-10-2 in FD20