I recently read that in pre-grouping times, the locomotives of 7 different companies could be seen at York station. Since reading it, my mind keeps coming back to the question "which companies were they?", and it's mildly distracting that I can't complete the list (as if there are not far more important things in life to be pre-occupied with!!). I can think of 3 definite candidates - the North Eastern obviously, the Great Northern handed-over some trains there, and some Lancashire & Yorkshire trains terminated there. But who were the other 4 companies? Or is the overall count of 7 companies incorrect? Please someone help me out here. Thanks.