Firstly, there is very little concreted track in this project. It appears to be the two level crossings as well as the three tram stops and the track in that immediate vicinity, including the tunnel extension at the present hospital tram terminus.
In all those situations they appear to pre-lay concrete with a rectangular slot formed into it, into which the rail and its insulating material is placed. This is basically hows the original Sydney light rail track was laid between Central Station and Paddys market.
Stage one of the Gold Coast line was not terribly different from the present system being used in Sydney except for the 10 feet of concrete laid under it!
As for photo 4, I have no idea what they are going to do there but I'm quite certain it will not be to dump concrete to fill up the hole. I'll have to keep a watch on it.
> On 15 Jul 2017, at 1:22 pm,jg62430@... [TramsDownUnder] TramsDownUnder@...> wrote:
> In the mass concrete track, how is the gauge established in the construction process? In the Jetty Rd track it was through tie-rods between the rails whereas in Melbourne it was the use of the half sleepers. In photo 4 the track seems to be constrained by rail bolts screwed into the wooden sleepers.
> Alex C