Assertion: railroad's locomotive | /r/HasAspect | horn
Facets:
value: in the united states
type: LOCATION
value: in countries
type: LOCATION
Source sentences:
text: In the United States and in countries following United States practices, a locomotive must have a bright headlight and ditch lights (two lights located below the headlight but above the pilot), a working bell, and a whistle or horn that must be sounded four times (long-long-short-long), similar to the signal for the International Morse Code letter "Q", as the train approaches the crossing.