TE10M (modernized) is a Soviet mainline freight diesel locomotive with a sectional capacity of 3000 hp. s., built by the Voroshilovgrad diesel locomotive plant from 1978 to 1990. An upgraded version of 2TE10V, the main difference from which was the ability to work in up to three sections according to the system of many units. It was produced in three- (3TE10M) and two-section (2TE10M) versions. Also in the mid-1980s, a batch of diesel locomotives 4TE10S was produced, which are four-section TE10M, adapted to work in a cold northern climate.