diesel locomotives used by the Romanian State Railways (CFR)
from 1966. A total of 633x units are delivered, initially registered 040-DHC-001 - 663.
Later on, these units are divided in 3 distinct classes:
- Class 80
for standard gauge and equipped with a steam generator for passenger trains heating;
- Class 81
for standard gauge and without a steam generator;
- Class 84
for broad gauge railways in the eastern part of Romania.