A Garratt locomotive is a type of three-part articulated steam locomotive invented by the engineer Herbert William Garratt. Its boiler, firebox, and cab are mounted on a centre frame or "bridge". The
The Garratt with the highest tractive effort in the world was the East African Railways 59 class. Its tractive effort of 83,350 pounds was twice that of a British Railways class 9F 2-10-0