Russian locomotive class VM

The VM or BM (Cyrillic script) was an experimental Soviet diesel-electric locomotive named after Vyacheslav Molotov (Russian: Вячеслав Молотов). It was a two-unit machine of 2-Do-1+1-Do-2 wheel arrangement and only one pair of locomotives was built.[1]

VM or BM
VM or BM class diesel-electric locomotive
Type and origin
Power typeDiesel-electric
Build date1934
Specifications
Configuration:
​
 • UIC2-Do-1+1-Do-2
Loco weight2 x 123 tonnes (121 long tons; 136 short tons)
Prime moverTwo Soviet-built diesel engines
MAN design
RPM rangeMax. 400 rpm
TransmissionDiesel-electric
8 x 207 hp (154 kW) traction motors
Performance figures
Power output2 x 1,050 hp (780 kW) (diesel)
Career
Number in class1 pair

Powertrain

The two diesel engines were of the six cylinder, four stroke type. They were Soviet-built and based on the MAN engine used in the Soviet E el-5 locomotive. The MAN engine was rated at 1,200 hp (890 kW) at 450 rpm but the Soviet engines were de-rated to 1,050 hp (780 kW) at 400 rpm. The traction motors were similar to those used in the Soviet E el-12 locomotive but the rating of each motor was increased from 190 hp (140 kW) to 207 hp (154 kW).

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References
  1. Westwood, J.N. (1963). Soviet Railways Today. London: Ian Allan. page 69


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