Climate change protesters brought London's DLR to a halt as they staged a protest on the roof of a train at Canary Wharf station.
It comes as part of a series of demonstrations from Extinction Rebellion in the capital which have led to more than 340 people being arrested.
The protests have led to road closures, traffic gridlock and serious disruption to public transport and local businesses, with 55 bus routes closed and 500,000 people affected.
The campaign group had said it was planning to "non-violently disrupt Tube services to highlight the emergency of ecological collapse" on Wednesday if the Government does not meet its members.
Four activists also glued themselves to a fence outside Jeremy Corbyn's home in the afternoon but left after a few hours.
