Assertion: railroad's train | /r/CapableOf | go on a single-track line
Facets:
value: not necessarily
type: DEGREE
value: past
type: TEMPORAL
Source sentences:
text: About all they can tell a train-watcher is that a train has just gone past or, on a single-track line, that there is something coming (from behind the observer), though not necessarily in the block-most automatic block systems are arranged so that a moving train will set signals at stop in front of it as far as the next siding.