From the Wikipedia page [1]
Swanley railway station is on the Chatham Main Line in England, serving the town of Swanley, Kent. It is 17 miles 31 chains (28.0 km) down the line from London Victoria and is situated between St Mary Cray and Farningham Road on the main line. The Maidstone Line branches from the main line south of Swanley and the next station on that route is Eynsford.
The station and most trains that call are operated by Southeastern. The station has four platforms.
Since March 2016, Oyster cards have been accepted at Swanley, with the station being placed into London's fare zone 8.