Eco-warriors forced London to grind to a halt for a third day amid protests that have cost businesses £12 million ($A22 million).

The Sun reports that hard-working Londoners have been left furious after protesters stormed the train at Canary Wharf station and climbed on top of a DLR carriage — forcing commuters to be evacuated.

Two activists from Extinction Rebellion clambered on top of the carriage and unfurled a flag with the slogan “climate emergency” as a third stuck his hand to the window.

Angry passengers were forced off the train as the demo — which has already closed Waterloo Bridge and blocked Oxford Circus — continued into its third day.

British Transport Police eventually had to tie harnesses around the protesters on top of the train, and asked them to wear eye masks, as they removed them.

Police in hard hats and safety harnesses were seen clambering on top of the DLR carriages to slowly haul the demonstrators down before the pair were arrested.

But while the protesters have insisted they have “no choice” but to cause disruptions, innocent locals spoke of their fury as London’s West End businesses revealed they had lost £12 million ($A22 million).

Sefan White, 24, who works for a packaging company, said: “I’m devastated. I’m trying to get to a job now. We’ve got to go round Camden on a 30-pub journey and we’re going to be late now.

“We’re probably going to lose money today.

“They’ve had their picture, fair enough, that’s all you need now. Why is he spending 15 minutes on top of the tube? Explain that.”

The two people who sat on the roof had also stuck their hands to the train.

This seems a favoured tactic of the mob, after members glued themselves to the Shell HQ and to trucks blocking Waterloo Bridge to make it harder for cops to remove them this week.

“Targeting public transport in this way would only damage the cause of all of us who want to tackle climate change, as well as risking Londoners’ safety and I’d implore anyone considering doing so to think again.”

This article originally appeared in The Sunand is republished here with permission