PKP Class ST40is a new class of cargo diesel-electric locomotives used by thePKP LHSbroad-gauge division and various Polish private operators, designated 311D (standard gauge) or 311Da (broad gauge) by its manufacturer,Newag.The class is a heavily reconstructed SovietM62(PKP ST44), using only the underframe. The body is new, the main engine is a General Electric GE 7FDL12. Original engines were also modernised, as ED118 A GE. The class is much more economical and modern than a basic M62. The body has external walkways instead of an internal passage connecting the cabs.
The first locomotive was modernised in 2007. As of January 2009, there were 20 class 311D completed (15 forPCC Railand five for the Baltic Railways) and six 311Da for PKP LHS, where they are designated ST40.
The locomotive is a modernisation of the popular Soviet locomotiveM62(ST44), which can be noticed by the chassis structure and carriages. The drive unit has been completely changed by installing a more efficientengineby theGeneral Electriccompany which is placed in one place together with the maingenerator,compressorandfan.The most visible change is the complete change of the structure, the internal passageway between the cabins, having a driver's cab at each end and that the train has transitions outside with the jetties. By using the graft this has improved access to the engine.[clarification needed]The front of the locomotive has been changed, giving a new look. The cabin has a new design and provides better working conditions.
