British A.I.O.C. inland screw steam tug Diyala stationed at Abadan, Persia in May 1946

Gross register tonnage 60 tons, horsepower 250 ihp and as dimensions 81.9 (over all) x 17.2 (extreme beam) x 3.11 (maximum loaded draught) feet. Part of the fleet of Anglo-Irian Oil Company (A.I.O.C.).

Source
Quatar Digital Library's digital archive. Naval Intelligence Diversion Admiralty, S.W. 1, Persia Intelligence report May 1946-C.B, 1885 (X) (5/46) Website