Assertion: steam engine's steam | /r/CapableOf | turn wheel
Facets:
value: to pull a train
type: PURPOSE
Source sentences:
text: How a spirit level works; How track is constructed, including how the joints allow the rails to expand on hot days; How the wheels keep the train on the tracks; Couplings and buffers; How the boiler makes the steam; How the steam is used to drive pistons and turn the wheels to pull a train.