You are right regarding the sleepers. The second track was started sometime about 1951. About that time I had a number of medical appointments in the city (Yes, they did ultimately find a brain!) and Mum took me to the city by train. I recall the track being built, even then I recall that progress was slow. I was about 3 years older when the second track finally got to pass my home at Warradale/Hove. Sunday mornings were great. The work train hauled by a 700 class would stop outside our front door. OH&S was different then (I know Tony) and all us kids used to swarm over the loco, the crews were great blokes. I always got called in to go to Sunday School; drats!
BTW. I saw the Jubilee train when it visited Clare; I was staying with my grandparents whilst M&D were waiting for our house. Even at age 4 I was fascinated by the radio and electrical exhibits which led to a 40+ year career in electrical engineering, seeds sown.
The car set had been a wartime hospital train.
David, another correction. 3 position UQ signalling was introduced by Pilkington in 1913 and was well established when Webb arrived. It would have been about the only thing Webb would have recognised. How Pilkington got it past the entrenched conservative management is a mystery.