510 Spadina

510 Spadina
Flexity Outlook streetcar southbound on Spadina Ave. south of Queen St.
Overview
Type	Streetcar Route
Locale	Toronto, Ontario
Termini	Spadina Station (North) Union Station (South)
Stations	Spadina Union Queens Quay
Daily ridership	43,804 (2014)
Operation
Operator(s)	Toronto Transit Commission
Depot(s)	Leslie Barns
Rolling stock	Flexity Outlook
Technical
Line length	6.165 km (3.83 mi)
Track gauge	4 ft 10 7⁄8 in (1,495 mm) - TTC Gauge
Electrification	600 VDC Overhead
Route number	510

510 Spadina (317 Spadina during overnight periods) is a streetcar route in Toronto, Ontario, Canada, operated by the Toronto Transit Commission.

Spadina's streetcar service began in 1891, when a loop route called the Belt Line operated on Bloor Street, Spadina Avenue, Sherbourne Street, and King Street. In a 1923 reconfiguration of the streetcar network, this service was discontinued and Spadina became a separate streetcar route. This route was 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.

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.