Trains have been cancelled or delayed this morning due to a fallen tree. All services between London and Dartford via Woolwich are being affected. Southeastern warned commuters on X, formerly known as Twitter, of the disruption at about 5.50am this morning. “Because of a tree on the line between Maze Hill and Greenwich, no services can run between London and Dartford via Woolwich,” the rail firm said. Woolwich line trains are also being diverted via Sidcup or Bexleyheath. The train company says commuters can use their ticket for no extra cost on other transport links. This includes the DLR bet…