Climate change campaigners halted a coal train yesterday outside Drax, Britain's biggest power station, and shovelled its contents on to the only line into the plant. More than 20 tonnes of coal blocked the tracks as protesters strung ropes between the train and the girders of a river bridge as police watched from a distance. More than 30 protesters swarmed aboard the 21-wagon freight service. Hidden in banks of cow parsley beside the line to Drax, North Yorkshire they struck at 8am after watching two empty trains arrive to collect ash in the previous two hours. The train had halted...