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This bumbag-wearing gentleman brought one of the UK's busiest train stations to a standstill this afternoon.

Sometime before 4pm the man, clad all in white with a bandana on his head, trespassed on to the tracks at Waterloo.

He then stood seemingly shouting at passengers on board a nearby train.

The dramatic incident was captured in a series of tweets posted by user @decath10n - which you can enjoy in sequence in the Storify below - who was himself on the train and said the man banged on the window with a rock.

British Transport Police converged on the individual, who appeared to remonstrate with them - then he seemed to point out someone on the train.

Officers then entered the carriage to speak to a man whom @decath10n said had goaded the trespasser.

South West Trains were forced to turn the power off to all lines, causing huge delays with no trains able to get in or out of Waterloo.

Around quarter-past four SW Trains advised customers to seek alternate routes as the man was still on the tracks with British Transport Police.

A few minutes later, they tweeted: "The person is now secure and on the platform we arranging to get power back on now."

If you haven't been caught up in the travel chaos, enjoy the full story below...