Thirty climate campaigners today stopped a coal train on its way to Drax power station in Yorkshire, Britain's single largest source of CO2 emissions. Dressed in white overalls and canary outfits, they used safety signals to stop the train at a bridge on a branch line used exclusively by the power station, before jumping aboard and shovelling coal off onto the tracks. Some used climbing ropes to suspend themselves under the bridge from the train, making it impossible to move the train while the protest continues.