During his absence in England on official business, this was changed by Mr T. Middelton to an 0-6-0 type with 4 ft 0 in diameter driving wheels, claiming that such locomotives would be capable of 30-33 mph in service.

Despite Scott's protests, Commissioner Goodchap approved the changes and six locomotives were designed and built by Vulcan Foundry.

[2] In August 1884, Scott informed the commissioner that more locomotives were required with the opening of the Illawarra extension.

The design was extremely similar to a number of 2-4-0T locomotives supplied to the Isle of Wight Central Railway from 1864.

The entire class was subsequently withdrawn from passenger work and allocated to various shunting, yard, and depot duties.

[6] Two have been preserved: Media related to New South Wales F351 class locomotives at Wikimedia Commons