Newag 6Dl

The modernisation involved work on an entirely new body on the existing chassis, with the use of fuel tanks, which were included in the modernisation. The locomotive uses two Caterpillar C18^[4] diesel engines with a capacity of 563 kW connected to synchronous generators.^{[5][verification needed]} Each of the units included a new exhaust system, which is supported on the refuge. The engine exhaust systems with the diesel filters are DOC types.^[6] Built-in power generators can operate in two configurations: the first uses the power of both motors for traction, the second uses the power of the traction to power the cabin of the train.^[7]

In 2020, there have been problems with the mechanism of some locomotives, which caused the trains to be delayed, being hauled by other locomotives, or in some cases, replaced by bus transport.^{[citation needed]}