Assertion: steam engine's use | /r/HasProperty | impossible
Facets:
value: due to the risk
type: CAUSE
value: previously
type: DEGREE
Source sentences:
text: Akroyd-Stuart developed the world's first locomotive powered by a hot bulb oil engine, the "Lachesis", for the Royal Arsenal, Woolwich, where the use of locomotives had previously been impossible due to the risk.