The «X» series tram (Tramway «Kh» series) is a Soviet serial standard two-axle double-sidedtram.
Project year 1925 Manufacturing plants: Mytishchi Machine-Building Plant, Moscow, USSR Ust-Katavsk Carriage Works, Ust-Katav, USSR Year of release: 1927 1941 Year of operation: 1928-early 1970s First city of operation: Kharkiv, 1928