In 1955 Tomlinsons built three 6000 gallon tankers for AMPOL (155-7). They were followed by a further three (158-160) from Hume Steel in 1958 and a final pair (161/2) also from Hume steel, in 1961. There do appear to have been detailed differences in the domes on these tankers.

The WAGR outline diagram is shown below.