 Austral Otis encountered difficulties and withdrew from the contract in November 1912, leading to that contract being re-offered.From 1914 newly delivered engines were consecutively numbered.Between 1914 and 1919 Newport delivered three batches of 20 engines each, numbered 873-912, 943-962 and 1013-1032, at a rate of 20 per year except the final two, delivered in 1918 and 1919 respectively.