Assertion: compressed air locomotive | /r/HasProperty | tucked in coal mines
Facets:
value: around the world
type: LOCATION
value: safely
type: MANNER
Source sentences:
text: With the hopeful days of air powered street transit over, the compressed air locomotive was safely tucked away in coal mines around the world because it created no heat or spark and was therefore invaluable in gassy mines where explosions were always a danger with primitive electric or gas engines.