That would make the programme too dependent on the connection. Other than bridgework, its the single most complicated part of the job and doing it with low traffic in reasonably good weather is a good idea. The alternative would be Christmas-New Years week, but I suspect a week isn't long enough. I imagine a different team does points compared to ordinary trackwork.
The nightmare would be that the line is finished and commissioning and service start would be delayed by this.
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