Harley Dalrymple-Hay | |
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| Born | 6 October 1861 |
| Died | 17 December 1940 |
| Known for | Underground railway systems |
Sir Harley Hugh Dalrymple-Hay (1861-1940) was an engineer working on underground railways in and around London, England. He was awarded the Telford Medal in gold by the Institution of Civil Engineers for his paper on the Waterloo and City Railway.