Union Station in Toronto is the largest and busiest railway station in Canada, serving as a massive multimodal transportation hub for the entire country. Spanning an entire city block on Front Street, this historic Beaux-Arts building handles over 300,000 passengers per day—more than any airport in Canada. It serves as the primary hub for VIA Rail (long-distance), GO Transit (regional commuter), UP Express (airport link), and the TTC (subway). Following a massive decade-long "revitalization" project completed in the early 2020s, the station now features extensive underground retail, dining "food courts," and modernized concourses like the Bay and York halls. Architecturally, its "Great Hall" is a national historic site, featuring 40-foot-high limestone columns and a stunning vaulted ceiling. While Montreal’s Gare Centrale is also significant, Toronto’s Union Station remains the undisputed heart of the Canadian rail network, acting as the critical "anchor" for the high-density Quebec City–Windsor Corridor where the majority of the nation's rail traffic is concentrated.