But ddnt metrolinx completely replace a bridge and a diamond track during the georgetown construction in overnight shifts?
They can do it. They just need to plan it smartly. Macroscopically they need to realise that stretching construction out to save on construction costs for infrastructure and roadworks do have adverse
spinoff effects due to congestion and lost productivity. The irony about that is that the money lost due to the latter wouldve probably paid for the extra for a faster construction and probably more.
There is a big different between the West Toronto Diamond Bridge movement and TTC intersection track work.
The diamond bridge was built on site before hand and move into position in a matter of hours. The excavation took the longest and it vary from bridge to bridge from 6-14 hours. Once in place, back filling has to be done before CP install the new tracks.
The intersections have to be completely dug out and the time vary from intersections to intersections based on size and track work. Forming and pouring the based again vary as to what can be done as the excavation take place and other work that needs to be done first before the base is pour. Once the base is pour, the various sections of track work that built off site is install under the overhead still in place. It takes more time to install the track work with the overhead in place than none at all, but will require more money and time to remove the overhead and reinstall it as well power lines.
TTC starts the track works with the centre diamond and work out one track at a time for the switches and then does the other before moving the crane to the next location to add the next sections of switches and track work. TTC crews levels the new track work and bolt them together or weld them with welding taking hours to do. Once this is done, then the one or two concrete pour is done to top coat the rails. Then the concrete is pour between the new tracks and the road or the whole road depending on the condition of the road based in the first place. Depending if the road is all concrete or has to be pave, paving can only take place after X hours after been pour. Depending on the intersection, some sidewalks have to be rebuilt since they need to and this will happen first while the track work is taking place.
Since Dundas and Victoria intersection is a curve area, some extra time will be require to do it, but doesn't stop work being done on the straight section. Doing the straight section will require less time to the point it can be finish with the missing section to connect to the switches before the intersection is done. It comes down to manpower to do this.
Its time the City and TTC start doing 24 hour work hours to get the work done sooner than later, but TTC doesn't has a good track record for the 24 hour work window by not having anyone doing the track work for straight track work like they are supposed to be doing.
Not easy to do as you stated.