sentences:  In June 1994, the mall was extended northward through Chinatown to Union Station (used by Amtrak) and the Greyhound bus depot.Short, unconnected additions were made in the area around Portland State University in the early 2000s.TriMet's Fareless Square (renamed the "Free Rail Zone" in 2010) encompassed the entire mall until discontinued in 2012, and these two facilities/measures, among others, have contributed to TriMet's having become one of the nation's most successful and most-studied public transportation systems.