Ion rapid transit

Ion, stylized as ION, is an integrated public transportation network in the Regional Municipality of Waterloo in Ontario, Canada. It is operated by Keolis and is part of the Grand River Transit (GRT) system, partially replacing GRT's Route 200 iXpress bus service. The section of the bus route serving Cambridge has been renamed "Ion Bus", and renumbered as 302. The first phase commenced operations on June 21, 2019, between the north end of Waterloo and the south end of Kitchener. A future extension of light rail to the downtown Galt area of Cambridge (Phase 2) is planned but construction may not begin on that line until 2028.

In 2009, an Environmental Assessment (EA) began to create a proposal of electrically powered light rail transit through Kitchener and Waterloo, and adapted bus rapid transit from Kitchener to Cambridge. On June 24, 2009, Regional Council voted to approve the project, subject to funding from higher levels of government, which was in turn approved by council on June 15, 2011. This was followed by a community building strategy to guide development, identify key destinations, and strengthen regional connections. The strategy, led by Urban Strategies Inc. of Toronto, consulted hundreds of individuals and stakeholders from Cambridge, Kitchener, and Waterloo.

Construction began in August 2014 and service was expected to begin in late 2017; however, because of delays in the manufacture and delivery of rolling stock, the introduction of the light rail service was significantly delayed. The total cost of the system was estimated at $818 million, but in December 2017, the overruns were estimated to total approximately $50 million. The Province was expected to provide $25 million of that amount.