Fascinating social history there guys. It's a shame that there's such a preoccupation with locos, trains and engineering structures rather than the human stories of the railways.
Incidentally, Helig, just in case you were not aware, Harold joined the LNWR on 18th January, 1915 (at £30 pa!) and was initially at Nantlle Goods. He transferred to Gaerwen as a junior clerk on 10th January, 1916 with an increase in salary of a princely £5. He then went to the wages staff at Conwy.
Bri - talking of female staff, I think there were a few around here to fill the gaps left by men joining the forces. You may have seen that a statue has been erected in London to the first black (male) driver. Llandudno possibly had the first black woman porter, the late Joyce Taylor, who retired around 1967.