PKP Class ST40 is a new class of cargo diesel-electric locomotives used by the
PKP LHS broad-gauge division and various Polish private operators, designated 311D (standard gauge) or 311Da (broad gauge) by its manufacturer,
Newag
Newag S.A. (pronounced ''"nevag"'') is a Polish company, based in Nowy Sącz, specialising in the production, maintenance, and modernisation of railway rolling stock. The company's products include the 14WE, 19WE, 35WE types electric multiple u ...
. The class is a heavily reconstructed Soviet
M62 (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 April 2025, there were 48 class 311D completed, of which 27 are broad gauge 311Da units for PKP LHS, where they are designated ST40s.
Specification
The locomotive is a modernisation of the popular Soviet locomotive
M62 (ST44), which can be noticed by the chassis structure and carriages. The drive unit has been completely changed by installing a more efficient
engine
An engine or motor is a machine designed to convert one or more forms of energy into mechanical energy.
Available energy sources include potential energy (e.g. energy of the Earth's gravitational field as exploited in hydroelectric power ge ...
by the
General Electric
General Electric Company (GE) was an American Multinational corporation, multinational Conglomerate (company), conglomerate founded in 1892, incorporated in the New York (state), state of New York and headquartered in Boston.
Over the year ...
company which is placed in one place together with the main
generator,
compressor
A compressor is a mechanical device that increases the pressure of a gas by reducing its volume. An air compressor is a specific type of gas compressor.
Many compressors can be staged, that is, the gas is compressed several times in steps o ...
and
fan. 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. The front of the locomotive has been changed, giving a new look. The cabin has a new design and provides better working conditions.
Service
The first locomotives were built in 2007.
References
Sources
*
External links
*, Diesel freight locomotive 311D
*, Locomotives series ST40S / 311Da
5 ft gauge locomotives
Polish State Railways diesel locomotives
Railway locomotives introduced in 2007
Standard-gauge locomotives of Poland
Diesel–electric locomotives of Poland
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