North Kent Line

The North Kent Line is a railway line which branches off the South East Main Line at St Johns junction west of Lewisham station in Greater London and runs to Rochester Bridge Junction near Strood, Medway where it links to the Chatham Main Line.
The section from Charlton to Dartford is also referred to as the "Woolwich Line" in the context of Southeastern Metro services.
History.
Construction.
The North Kent Line was the means by which the South Eastern Railway (SER) was able to connect its system to London at London Bridge. In 1846 the SER purchased the Thames and Medway Canal tunnel near Higham and laid railway tracks through it; in 1847 trains were working through from the Strood terminus, on the River Medway to Gravesend. From 30 July 1849 the line was extended, via Blackheath, to a junction with the London and Greenwich Railway at North Kent East Junction, near Deptford, and through trains were now able to operate.
Electrification.
The line is electrified (750 V DC third rail). Electrification was initially to Dartford (6 June 1926) and was extended to Gillingham by World War Two.
Former services.
Between 1999 and 2002, there were semi-fast trains running from Plumstead to London Victoria briefly resuming a 1980s service pattern. This service was for the Millennium Dome; the service called at, Woolwich Arsenal, Charlton, Blackheath, Lewisham, Peckham Rye then non-stop to London Victoria. There was also an early morning semi-fast service to London Blackfriars from Dartford in the 1980s.
In 2003, there were plans to run a Plumstead to Clapham Junction service across South London, but it never came to fruition.
Route.
The line diverges from the Southeastern Main Line at Lewisham Vale junction at the country end of St John's station at the edge of Inner London, and runs as far as Rochester Bridge junction beside the River Medway by the north coast of historic mid-Kent.
Services.
The North Kent Line is a high-frequency line, with all stations in the London area being served by at least 4 trains per hour, with Lewisham having 14tph.
London Charing Cross to 2tph, calling at Waterloo East, fast to Lewisham (for Docklands Light Railway), Blackheath, Charlton, Woolwich Dockyard, Woolwich Arsenal (for the Docklands Light Railway), , Abbey Wood (Future interchange with Crossrail) Belvedere, Slade Green and Dartford.
London Cannon Street to all stations via Greenwich 4tph, of which 2tph continue back to Cannon Street via Bexleyheath and Lewisham on the Bexleyheath line and 2tph to Cannon Street via Sidcup and Hither Green on the Dartford Loop Line.
 to 2tph, Semi Fast calling all stations to West Hampstead Thameslink, St Pancras International, Farringdon, City Thameslink, London Blackfriars, London Bridge, Deptford, Greenwich, Maze Hill, Westcombe Park, Charlton, Woolwich Dockyard, Woolwich Arsenal, Plumstead, Abbey Wood, Slade Green, Dartford, Greenhithe, and all stations to Rainham.
Service patterns.
, the service pattern is:
Off-peak & Saturday:
Sunday:
Peak hour frequencies vary, with services from the Bexleyheath and Dartford loop lines also running to and from stations to Gillingham.
Future.
Abbey Wood station has been rebuilt to become the eastern terminus of Crossrail. However, a possible extension of Crossrail to Gravesend has been safeguarded.
Stations.
Train services working the Line today take the following route; the first ten miles (16 km) passes through many tunnels, included on the list:
The North Kent Line connects with the LCDR Chatham Main Line at Rochester Bridge Junction, about 200 m beyond Strood station. It totals some 30 miles (48 km) in length.