The T44 series is a Swedish diesel locomotive that is used mainly in freight train operation. In addition, it is also used in the transfer market and in shunting. The original for the Statens Järnvägar (SJ ) built locomotive is the diesel with the largest ever built in quantity Sweden. The majority of them now belongs to the state freight company Green Cargo, which is responsible for the freight train operating in Sweden in addition to other private companies. The locomotives are diesel- electric. To generate electricity for the electric motors of the 12 - cylinder V-type two-stroke diesel GM EMD 12 - 645E is used by General Motors. With multiple control up to three locomotives to operate.
Although intended for freight trains, they drove occasionally scheduled passenger trains, for example, in the 1970s on the then non-electrified route between Borlänge and Mora and in the 1990s on the Inland Railway.
Other locomotives are at the TGOJ Trafic, the Erzbahngesellschaft MTAS and in the Norwegian State Railways (NSB) in use. Some specimens have also been exported to Israel. The locomotives are stationed at Trelleborg in the south to Kiruna in the north.
Several locomotives of the series are equipped with radio remote control for one-man operation.
Series GC Td
Due to the age of the locomotives Green Cargo has in 2007 decided to modernize 100 locomotives to extend their life. In February 2009, it was rebuilt T44 371 at Bombardier Transportation in Randers in Denmark as a prototype and was used to Td 317 In T44 409 of the remodeling took place in 2010, she is now managed as Td 409. Here, the two-stroke engine is replaced by a four-stroke engine with improved fuel economy and lower emissions. After the modernization of the locomotives can be operated with the locomotives of Rc and the Bombardier TRAXX family in addition to the multi- control with locomotives of the same type. They will also be prepared for the installation of train protection system of ERTMS. Until May 2012 53 locomotives were rebuilt. End of 2012, all 62 planned vehicles were rebuilt.
After the conversion, the locomotives were given the series designation GC Td.