wow nice piccies. love the old ones.
illtry and date some
somewhere between 1915-20. postal bldg was built in 1913.Central clock tower is uc at central railway.
pic 2-it says 1932.lol,
i would of said before 1934. thats when the port cochere was demolished n front of Town hall.
pic 3-i think Wynyard station was built in late 1920s?
pic4-all the 1930's skyscrapers are there. AWA is actually out of pic at far right. im pretty sure its late 1940's.(dental hospital at left of central is complete, that was completed in 1943.
pic5-same as pic3.
pic6-it says 1930. which is right. Grace bldg and Aspestos house is new.
pic7-it says 1929. yep. Waltons tower is uc.
the City Railway was constructed almost entirely cut and cover. The tunnels were then brick lined. Actually Goulburn St-Wynyard is more likely concrete, but Goulburn St-St James was constructed very traditionally with, yes, mostly shovels. It's not a lot different to the country's first major tunnel - a brick water tunnel from the Centennial Park ponds to Hyde Park fountain.
Moving on a few year, the Eastern Suburbs Railway was constructed with road headers. This is because it traverses mainly sandstone. These are the same sort of small rock 'eating' machines used on road projects. They allow you to 'eat' any shape tunnel you want - in the case of single track rail tunnels, a rectangle with a rounded ceiling for the overhead. ESR tunnels are then concrete sealed. Modern tunnels of this sort are likely shotcrete sealed (as it is likely the new tunnels on the ESR at Bondi Junction will remain).
The New Southern Railway (airport line) was constructed with a TBM. This is because it traverses a lot of soft clay and travels under the Alexandra Canal and the Cooks River: the ground is simply unsuitable for any other type of tunnelling other than a single machine that could line the tunnel in concrete as it excavated. The NSR is single bore for similar reasons, the floor of the tunnel is then filled to a level that is (1) flat and (2) both tracks can be run.
The Epping-Chatswood Railway traverses more favourable terrain (and note that the Lane Cove River tunnel is being built cut and cover with coffer dams) but due to its length and lack of tunnel access points is being built again with TBMs, but in this case two single bore tunnels.
I've posted about this before, but go to the local NSW Railfan shop (Strathfield or Redfern, can't remember) and get 'Sydney's forgotten city railways' book, from memory it was bout $15 here from Railfan shop on cnr of Market st & Flinders lane.
really cool pics, like looking south from Museum station and see the tunnels to Central and the tunnel portals leading toward Oxford Street
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