Urban transit is an increasingly important topic addressed by the national and regional associations of the organization. The organization's support for the O-Train pilot project (today's Trillium Line) was a significant factor in returning rail transit service to Ottawa in 2001. Transport Action Canada has since been critical of the subsequent plans to develop the North-South Light Rail Transit line, citing the proposals to combine the downtown train with bus congestion, disruption to existing O-Train travel (today's Trillium Line) during the line's construction, and longer-term viability of the proposed North-South route.