Overland train disruption Tues 17th Sept. - blaze next to the track near Brockley brought trains to a standstill between Sydenham and New Cross Gate

[IlonaM]

https://www.standard.co.uk/news/london/travel-updates-latest-train-fire-delays-london-bridge-crystal-palace-brockley-overground-tfl-b1182426.html

'A fire on the railway tracks in south-east London has shut all lines in the area sparking major disruption.

The blaze next to the track near Brockley brought trains to a standstill between Sydenham and New Cross Gate on Tuesday morning.

Network Rail has warned the fire has damaged cables that supply electricity to the railway, causing heavy disruption to trains between London Bridge and Crystal Palace

London Overground services are only running between New Cross Gate and Highbury & Islington.

Meanwhile Southern and Thameslink services running through the area may be cancelled or diverted to and from London Victoria.

Heavy disruption is expected until midday.'

[OutOfFocus]

I assume by "overland" you mean "overground"