SM48 is the name for class of Soviet diesel locomotives operating in Poland for PKP.

The original designation was ТЭМ2 (TEM2), and was the Soviet-built version[citation needed] of the ALCO RSD-1.

There are also locomotives in service with other Polish operators: PCC Rail, PTKiGK Zabrze, Kopalnia Piasku Kotlarnia.

[2][3] In 2021, Tabor Dębica [pl] offered their version of modernization, designated 20D.

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