Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
The line was part of the London and Croydon Railway which opened in 1839. The station was opened on 6 March 1871. The station was demolished in the 1970s. Today's buildings are largely early 1970s design. The platforms are only located on the outer, Slow lines, since the station is only served by London Overground trains between Highbury and Islington and West Croydon or Crystal Palace, local trains between London Bridge and Coulsdon Town and by the London Bridge to London Victoria loop line via Crystal Palace, plus some London Bridge to Guildford and Dorking in peak times.
At the London end the line is crossed by the Nunhead to Lewisham line. At this location adjacent to Brockley station was sited Brockley Lane station which closed in 1917 with the original London, Chatham and Dover Railway branch to Greenwich Park. The connection of that line to Lewisham is a later development. The possibility of opening platforms on this line with direct access to Victoria Station and the Bexleyheath Line to Dartford has often been suggested, and a proposal to create a new Brockley Interchange station is included in the London Borough of Lewisham's 2019-2041 transport strategy, though with no funding as yet identified for the project.
Crofton Park, on the Blackfriars to Sevenoaks line, and which also runs from Nunhead, is a mile to the south. Neither of these other lines has a physical connection with Brockley station, despite the trains running over the station. The next station to the north is New Cross Gate, and the next station to the south is Honor Oak Park.
Brockley forms part of the new southbound extension of the East London line (now the Windrush line) that opened on 23 May 2010 and forms part of the London Overground network. Ticket barriers were installed at this time.