National Rail train lines (with links to the accessible detail on the stations) - plus an honest and impartial perspective added.
You can visit the First Capital Connect pages to confirm timetables, but here are a number of lines which they run.
Kings Cross, Moorgate, Old Street, Essex Road, Highbury & Islington, Drayton Park, Finsbury Park, Harringay, Hornsey, Alexandra Palace, New Southgate, Oakleigh Park, New Barnet, Hadley Wood, Potters Bar, Brookmans Park, Welham Green, Hatfield. Welwyn Garden City, Welwyn North, Knebworth, Bowes Park, Palmers Green, Winchmore Hill, Grange Park, Enfield Chase, Gordon Hill, Crews Hill, Cuffley, Bayford, Hertford North, Watton-at-Stone, Stevenage, Hitchin, Letchworth Garden City
Kings Cross, Moorgate, Finsbury Park, Potters Bar, Hatfield. Welwyn Garden City, Welwyn North, Knebworth, Hertford North
Brighton, Gatwick Airport, East Croydon, Sutton, Wimbledon, Sevenoaks, Bromley South, Elephant & Castle, London Bridge, Blackfriars, City Thameslink, Farringdon, St Pancras International, Kentish Town, West Hampstead Thameslink, Cricklewood, Hendon, Mill Hill Broadway, Elstree & Borehamwood, Radlett, St Albans, Harpenden, Luton Airport, Luton, Leagrave, Harlington, Flitwick, Bedford
Bedford, Luton, Luton Airport Parkway, St Albans, Kentish Town, St Pancras International, Farringdon, City Thameslink, Blackfriars, Elephant & Castle, Loughborough Junction, Herne Hill, West Dulwich, Sydenham Hill, Penge East, Kent House, Beckenham Junction, Denmark Hill, Peckham Rye, Nunhead, Crofton Park, Catford, Bellingham, Beckenham Hill, Ravensbourne, Shortlands, Bromley South, Bickley, St Mary Cray, Swanley, Eynsford, Shoreham (Kent), Otford, Bat & Ball, Sevenoaks, Petts Wood, Orpington
Luton, Luton Airport Parkway, Harpenden, St Albans, Radlett, Elstree & Borehamwood, Mill Hill Broadway, Hendon, Cricklewood, West Hampstead Thameslink, Kentish Town, St Pancras International, Farringdon, City Thameslink, Blackfriars, London Bridge, Elephant & Castle, Loughborough Junction, Herne Hill, Tulse Hill, Streatham, Tooting, Haydons Road, Wimbledon, Wimbledon Chase, South Merton, Morden South, St Helier, Sutton Common, West Sutton, Mitcham Eastfields, Mitcham Junction, Hackbridge, Carshalton, Sutton