ET40 is the name for Bo′Bo′+Bo′Bo′ two-unit freight electric locomotive in service of Polish national rail operator, PKP.

[1] During the 1960s and 1970s, a massive increase in freight transport was seen in Poland, especially on the routes between Silesian coal mines and Polish Baltic ports.

As a development of EU05 locomotive the ET40 technical features are in many ways similar to its predecessor, this refers mostly to the electric installation.

Crew compartments are heated with a fan powered electrically; windscreens are equipped with de-freezers and wipers.

The right one leads to high voltage section, whilst the left provide access to the other crew compartment through a corridor running along the whole locomotive.

Auxiliary fixtures, like traction motors cooling systems, resistors and main compressor are located in the rear part of the section.