 They took over hauling "The Fish", from Sydney Central to Mount Victoria in June 1918 and the "Caves Express" on the same route in 1932.To operate this 3506, 3526 and 3535 were painted in Caledonian Blue to match the carriages.After being replaced by 36 class locomotives on Southern and Western services they were transferred to operate North Coast and Northern Tablelands express and mail trains until replaced by diesels in the 1950s.