Assertion: railroad's track | /r/HasProperty | become common
Facets:
value: on main lines
type: LOCATION
value: since the 1950s
type: TEMPORAL
Source sentences:
text: The first welded track was used in Germany in 1924. and has become common on main lines since the 1950s.
text: The first welded track was used in Germany in 1924. and has become common on main lines since the 1950s.