After 1973 the acquisition of additional high-speed diesel locomotives was considered to complement the BDZ park for the Septemvri - Dobrinishte line and especially for the replacement of the steam tram along the line Cherven Bryag - Oryahovo.
[1] Thus a construction and supply contract was signed with the Romanian plant "23 August" (now FAUR) - Bucharest.
The program was implemented and all locomotives were put into operation from May to September 1977, and 76-15 arrived in February 1978.
After the cessation of the operation of the Cherven Bryag - Oryahovo and Varvara - Pazardjik lines in 2002, the scrapping of locomotives in the two main narrow-gauge depots (Cherven Bryag and Septemvri) took place and in the park of BDZ four locomotives of class 76 remained.
In 2009, BDZ sold 3 of them to Argentina, and one was left for a museum exhibit and was stored in the Septemvri depot.