premise: Kootenay Loop is a major public transit exchange in Vancouver, British Columbia. Opened on August 20, 1950, it is the eastern-most major exchange in the city of Vancouver with routes servicing East Vancouver, Downtown Vancouver, Burnaby, North Vancouver and the Tri-Cities.
hypothesis: Vancouver only has one public transit exchange. 
reason: The context states the the Loop is the eastern most public transit.  By saying easternmost, it implies there is a westernmost. 