510 Spadina (310 Spadina during overnight periods) is a Toronto streetcar route in Ontario, Canada, operated by the Toronto Transit Commission. History Earlier routes Streetcar service on Spadina Avenue began in 1878 as a horsecar line operated by the Toronto Street Railway. In 1891, the Toronto Railway Company created a route called the Belt Line that ran as a loop along Spadina Avenue, Bloor Street, Sherbourne Street, and King Street. In 1923, the Toronto Transportation Commission reconfigured the streetcar network, discontinuing the Belt Line and creating Spadina as a separate streetcar route. The Spadina route operated until 1948, when it was replaced by buses. The tracks on Spadina between Dundas Street and Harbord Street were used by the Harbord streetcar route until its discontinuation in 1966, after which, only the tracks between King and College streets were retained for diversions along Spadina Avenue. Modern route The modern 510 Spadina route began as the 604 Harbourfront LRT route along Queens Quay in 1990, using CLRV and ALRV streetcars. The route was later renamed the 510 Harbourfront. It became the 510 Spadina and replaced the 77 Spadina bus when a new dedicated right-of-way was opened in 1997. The right-of-way extended the track north along Spadina Avenue from Queens Quay to Spadina station on the Bloor subway line. The term "light-rail transit" (LRT), which had been adopted to project an image of modernity, was dropped when it led to residents and newspaper reporters imagining elevated guideways like those of the Scarborough RT running through their streets. It was found that the project was much easier to sell to the public and politicians when it was described as an improvement to the speed and reliability of traditional streetcar service. In 2000, when the Queens Quay streetcar tracks were extended west to Bathurst and Fleet Streets, the name Harbourfront reappeared for a 509 Harbourfront route between Union and Exhibition Loop. The 509 and 510 routes share the trackage that had been used by the 604. In 2005, The Globe and Mail newspaper published an article that criticized the switch to a dedicated right-of-way streetcar as being less beneficial than promised. Based on TTC documents, the author argued that service is about one minute slower (from Queens Quay to Bloor) during afternoon rush hour than in 1990. The author also cited TTC documents which show that the cost-to-revenue ratio of the route has fallen with the