A railway (876 metres in length), including a station tunnel on the Midland City Line (Thameslink) beneath St. Pancras Station, commencing by a junction with that railway in tunnel at a point beneath Midland Road 145 metres north-east of the existing junction of that road with Euston Road, passing in tunnel north-westwards and northwards beneath the Regent’s Canal and terminating by a junction with that railway in tunnel at a point beneath the existing Midland Main Line 55 metres north of the northern abutment of the bridge carrying that last-mentioned railway over that canal;