On Thursday, August 3, 2017 at 2:06:46 PM UTC+5:30, wrote:

As an aside, how do trains on the ECML get south of the river, where's the
link to the current thameslink route?


Trains from the north either terminate at King's Cross or go to a through
station under St Pancras. To reach the latter, a tunnel was burrowed under
the canal to the north of St Pancras. When I checked a few months back,
the tunnel wouldn't be pressed into service for at least a year.