There was a platform at the Cross called 'York Road, Kings Cross' where these trains stopped. The 1974 timetable shows a train into Moorgate in rush hours only every 10-20 minutes (no real basic interval timetabling), starting from either Hertford North, Potters Bar, Hatfield or WGC. It also shows the trains calling at 'Kings Cross St Pancras' which I can only assume to be the Metropolitan Line platforms (?). Journey time from York Road to KXSP is 2 mins. Interestingly there are no balancing northbound workings from Moorgate in the morning peak, and the evening peak similarly contains no southbound workings. The sets must all have worked in and out of Moorgate ECS in the contra-peak direction. I believe class 105 Cravens DMUs were still the norm on GN suburban workings then, 10 years after that photo was taken. Longer distance workings to Cambridge were in the hands of class 31s hauling those non-corridor suburban coaches they use on the K&WVR.