Assertion: railroad's train | /r/HasAspect | a track warrant
Facets:
Source sentences:
text: For example, if Train 56 has a track warrant to proceed in the northbound direction from MP (milepost) 14 to MP 77 and there is a train following, then Train 56 must give up a portion or all of its warrant before the following train can be issued the track that Train 56 has already cleared.