South African Class 91-000
The South African Railways Class 91-000 of 1973 was a narrow-gauge diesel–electric locomotive. Between September and December 1973, the South African Railways placed twenty Class 91-000 General Electric type UM6B diesel–electric locomotives in service on its narrow-gauge Avontuur Railway between Port Elizabeth in the Eastern Cape and Avontuur in the Western Cape.
Source: Wikipedia — South African Class 91-000 (CC BY-SA 4.0)