John Mervyn Dallas WrenchCIE (15 September 1883 – 31 August 1961) was Chief Engineer of the Great Indian Peninsular Railway and later Chief Controller of Standards of the Railway Board of India from 1929 to 1940.[1][2][3][4] Also known as J. M. D. Wrench, he was made CIE in 1929.[5]
^Obituary in The Times, MR. J. M. D. WRENCH, September 2, 1961, p.10