The ChME3 was a 3₀-3₀ axle diesel locomotive manufactured by the Czechoslovakian company ČKD Praha for deliveries to the USSR. It served as the basis for the T669 series, a standard gauge diesel locomotive for Czechoslovakia's own railways, which differed primarily in track width and coupling type, as well as a number of similar locomotives for other countries.
Gear ratio:
1st gear - 3:2
2nd gear - 3:2
3rd gear - 3:2
4th gear - 3:2
5th gear - 3:2
6th gear - 1:-1
298 km/h - just the engine
310 km/h - engine + first boost
334 km/h - engine + second boost
335 km/h - engine + two boosts
338 km/h - engine + all boosts
