King’s Cross this afternoon has two departures at 1427, a Grand Central to Sunderland from P8 and a GN stopper to Royston from P10.
The theoretical maximum number of simultaneous departures from the whole King’s Cross and St Pancras complex, including LU, is 14: 2 from King’s Cross, 1 MML, 1 HS1 and 1 each direction Thameslink at St Pancras, 1 each direction Victoria Line, 1 each direct Piccadilly Line, 1 each direction Northern line and 1 each direction sub surface lines. No idea if that is ever actually achieved.