For those in the know what is the scale of work at waterloo particularly on the international side?
I assume complete strip/demolition of eurostars facilities and refurbishment of the platforms? Someone upthread mentioned final fit out works, is this mearly tiling/lighting/cosmetic or they building mew staff/passenger facilities in the I assume gutted out international terminal?
There are other threads that have touched on this, but basically the platforms in the former international terminal are being shortened significantly at both ends, while retaining enough length for 12 car trains. A hundred feet or more taken off at the buffer stops to provide a massive circulation concourse with a ramped bridge across to the existing concourse, and additional stairs and lifts forming a direct route down to the LU Bakerloo and Northern concourse. The long ramped bridge allows for the fact that the international platforms are a good few feet higher than the rest of the station.
Meanwhile at the country end the platforms are also being significantly shortened, and a much more flexible layout of crossovers is being installed to provide all the parallel moves to and from the Windsor side tracks that a high frequency service requires. The new crossovers will be well within the overall canopy.
Bear in mind that Eurostar had a fairly trivial number of services compared to the intended throughput of up to 18 tph when all the Windsor side services are transferred to platforms 19-24.
The platforms are only being prepared for temporary use in August however, after the blockade they return to worksite conditions for final fit out to full specification.
As far as I know, none of the former passenger handling facilities from the Eurostar operations will be re-used for public purposes. There will be rebuilt emergency escape routes from the modified platforms in line with the latest standards, but the planning drawings suggest they won't recycle the Eurostar routes.
In the main station extending platforms 1 to 4 impacts on the points and crossings in the throat, and the curvature of the platform 5 and 6 'island' also has to be changed as it curves towards the suburban tracks at the outer end. This has to be altered and is why the August blockade includes far more low numbered platforms than you might expect.