Bogies and traction motors from Class 36-000 locomotives were often used under the 2 ft (610 mm) narrow gauge Class 91-000 GE UM6B diesel-electric locomotives when they were being transferred between the Cape and Natal narrow gauge systems.
These "Bigfoot bogies" enabled them to travel under their own power on 3 ft 6 in (1,067 mm) Cape gauge.
Bigfoot bogies were also used under the narrow gauge locomotives whenever they had to be exchanged for maintenance purposes, sometimes running under their own power, sometimes hauled dead.

After most of the Class 91-000 narrow gauge locomotives were withdrawn, one of them was allocated to the Swartkops electric locomotive depot in Port Elizabeth for use as shunting engine.
It was also running on Class 36-000 bogies, but with only one bogie powered.
Bogies and traction motors from Class 36-000 locomotives were often used under the 2 ft (610 mm) narrow gauge Class 91-000 GE UM6B diesel-electric locomotives when they were being transferred between the Cape and Natal narrow gauge systems. These "Bigfoot bogies" enabled them to travel under their own power on 3 ft 6 in (1,067 mm) Cape gauge. Bigfoot bogies were also used under the narrow gauge locomotives whenever they had to be exchanged for maintenance purposes, sometimes running under their own power, sometimes hauled dead.
After most of the Class 91-000 narrow gauge locomotives were withdrawn, one of them was allocated to the Swartkops electric locomotive depot in Port Elizabeth for use as shunting engine. It was also running on Class 36-000 bogies, but with only one bogie powered.
South African Class 36-000