Assertion: roller coaster | /r/CapableOf | prevent train
Facets:
Source sentences:
text: A ratcheting mechanism used on a lift hill or section of a roller coaster that prevents the cars or trains from rolling backwards.
text: A toothed steel bar or device that is usually placed on the lift hill or other hills on a roller coaster that prevents the train from rolling backwards when the ratchet dog (anti-rollback device) attached under the car engages with the ratchet in the steel bar.