21.   They had jumped into a truck as soon as the unattended train rolled out of the rail yard.

22.   Trains rolled on time and the sun came out, as if it were part of the plan.

23.   When the Amtrak train to New York rolled into Niagara Falls last October, customs officers boarded it for a routine inspection.

24.   A passenger train rolled backward down a hill and crashed into a second train early today after its brakes failed.

25.   After finishing their repairs, the mechanics allowed the train to roll backward to test the engine.

26.   After finishing their repairs, the mechanics allowed the train to roll backward downhill to test the engine.

27.   After mechanics completed repairs they allowed the train to roll backward downhill to test the engine.

28.   As Ferguson began speaking, with spectators listening raptly, a train rolled past the courthouse, its whistle temporarily competing with him for attention.

29.   Thai engineers are helping Laos build its first railroad link to the outside world, but few trains will roll until China gets on board.

30.   The locomotive whistles back with a shrieking noise, puffs, the train rolls slowly alongside the ramp.