2-10-2T number 99 7247-2 begins to work harder now as the engine digs into the climb to the Brocken. I was unable to find the official figure for the ruling grade on the Brocken line but it appears to be 3.3 percent. Regularly scheduled steam locomotives are used exclusively on the Wernigerode to Brocken run with the exception of some special diesel powered trains or diesel rail buses.