context: LM-49 is a Soviet unilateral four-axle motor tram car. The abbreviation "LM" in the designation means "Leningrad Motor". The first prototype of the LM-49 car was built at the Leningrad Car Repair Plant (VARZ) in the 1949 year, so the subsequent serial trams of this type received index 49 in their designation. Typically, the LM-49 worked in tandem with the non-motorized trailed cars, the LP-49, which was the LM-49 hull with minor design changes due to the lack of traction motors, their equipment and the driver's cab.
question: When was the first LM-49 built?
answers.text: 1949