The Oahu Sugar Company operated a network of three-foot lines on the Hawaiian island of the same name that reached its maximum extent in 1939 with 60 miles or 97 km. It contained grades of up to three percent and very tight curves. Their main motive power consisted of a number of 0-6-2 saddle tank locomotives built by Baldwin from 1897.
They were originally fired by wood or even by sugar canes, since this was a fuel that could be obtained free of charge from the plantations. Starting in 1908, they were converted for oil firing. Although the company lasted much longer, the rail network was closed in 1950. Today three are surviving, which are No. 1 “Waipahu”, No. 5 “Waikakalua” and No. 7 “Puuloa”. 