This abbreviature was producer's official trademark before 1976, when new designation system for tram and subway rolling stock was introduced in the Soviet Union.
2.
It was built at the UZTM ( Russian abbreviature # " for # @ 0; LA : 89 02 > 4 " O65; > 3 > 0H8 = > AB @ > 5 = 8O Ural Heavy Machinery Factory, also called " Uralmash " ) in Yekaterinburg.
3.
First prototype of this vehicle was built in 1957 ( hence the 57 in the name ) at the Leningrad Wagon Repair Plant ( VARZ, , 5 = 8 = 3 @ 04A : 89 03 > = > @ 5 < > = B = K9 02 > 4-Russian abbreviature and full name ) . " LM " means " Leningrad Motor " tramcar.
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