It comes as something of a surprise to many people to discover that in the early 1940s Iraq State Railways were in the forefront of design so far as the steam locomotive is concerned. In 1940 Iraq State Railways completed the Baghdad Railway between Baghdad and Tel Kotchek on the border with Syria. This enabled the Taurus express to be introduced between Baghdad and Istanbul, Turkey, and for running this train a number of streamlined locomotives were ordered from Robert Stephenson & Hawthorns Ltd. These were the "PC" Class "Pacific" locomotives, with 5' 9" driving wheels. They were particularly noteworthy for their excellent double-bogie tenders with cabs.

No. 502 Mosul, was delivered in March 1941, but after the Iraqi government allied with Nazi Germany the delivery of the rest was delayed until after the British invasion of Iraq in May 1941. No. 501 Baghdad was delivered in October 1941, and No. 503 El Basra in December 1941. No. 504 Kirkuk was sunk en route by enemy action off the British coast and never reached Iraq. The "PC' Class were painted spring green lined out in white.
Builder's photograph of Iraq State Railways' "PC" Class 4-6-2 locomotive
Mosul to Baghdad sleeper approaching Baghdad West behind a "PC" Class 4-6-2
Mao of Iraq State Railways [courtesy of Wikipedia]