The series of 764.000 is the common type of steam locomotives (narrow gauge) for forest railways and in the C.F.R. system.

They were used in the combined transports in Târgu Mureș, Satu Mare, Alba Iulia, Turda and Sibiu rail yards areas.

The locomotive (construction number 3057) was one of the last such machines manufactured in Resita. It went to Fabrica de Ciment „Victoria Socialista“ / Cement Plant „Victoria Socialista” Turda and was set in work in 1959. Together with the engines CFR 764.103 and CFF 764.001, it was transferred in Resita, carrying the number plate CFF 764.493, in 1972, for the local historical collection of steam engines.

The first two locomotives of Dt-n2 produced in 1930 in Resita went to CSFG Ierbus;
- in 1933, a machine for the narrow gauge of 600m went to Fabrica de Ciment Cernavoda / Cernavoda Cement Plant.

There were two others, in 1936, for Forestiera Nadrag. The 20 next ones went to C.F.R. (1937), 3 to Minele Telic / Teliuc Mines (1941), and 6 to C.A.P.S. / Forests Chamber of Romania (1944).

In 1951 they had resumed production of the above type and 244 machines were manufactured after; 277 was the total number of Dt-n2 machines manufactured in Resita up to 1959 (Standard, CAPS, CFF, and CFR).

From a total of 20 steam locomotives for the People's Republic of China, exported in 1958, 10 belonged to that type (construction numbers from 3022 to 3031, and number plates from 11/A to 20/A).