Assertion: coaster's track | /r/CapableOf | prevent car
Facets:
value: from flying off the track
type: TRANSITIVE-OBJECT
Source sentences:
text: Each set of wheels includes a running wheel (on top of the track), a side friction (or "guide") wheel (to guide motion in the lateral plane and reduce excessive side-to-side movement known as "hunting") and an upstop wheel (beneath the track to prevent cars from flying off the track).