Northern operates more stations than any other single TOC in the UK. So, how many stations cannot be reached directly or with a single change from any Northern-managed station? I would suggest most of the Marston Vale line, though I'm ready to be proven wrong. Edits after a few requests for clarification: Light-rail/metro is valid as long as you start and finish at a national rail station. You can walk between Kings Cross and St Pancras without it counting as a change Examples: Norwich is accessible without changing because the East Midlands Trains Liverpool-Norwich service calls at Northern-operated Manchester Oxford Road Cam and Dursley is accessible in one change because the Aberdeen to Penzance service calls at Morpeth, so Cam and Dursley can be reached by changing at Bristol. Heathrow Central is accessible in one change because various services serve Kings Cross from Northern stations, and it's then possible to change to the Piccadilly Line Covent Garden doesn't count due to not being a national rail station Stourbridge Town is not accessible because all routes from every Northern station require more than one change.