due to declining ridership. Starting July 16, 1951, all King service turned back at Vincent Loop. On January 8, 1939, PCC streetcars were introduced on the King route on Sundays, displacing Peter Witt streetcars. On September 24, 1940, PCCs replaced Peter Witt cars in base service. On February 25, 1966, the Bloor–Danforth subway (today Line 2 Bloor–Danforth) opened, and Dundas West station replaced the Vincent Loop, and Broadview station replaced the Erindale Loop. Both new subway stations had, and still have, a streetcar loop within the fare-paid zone. Otherwise, the King streetcar route had changed little since 1923. In 2006, the TTC briefly considered adding couplers to streetcars to enable operation of streetcars in two or three units, a common practice until the opening of the Bloor–Danforth subway; the expectation was that this would keep them from bunching and becoming stuck in traffic. This plan was rejected in favour of ordering brand-new, longer Flexity Outlook vehicles. Starting June 19, 2016, a new route – 514 Cherry – was created to supplement 504 King service on King Street between Dufferin and Sumach streets. The 514 route increased capacity along the King Street corridor to address the growing downtown ridership. It also addressed accessibility concerns through its use of the low-floor Flexity Outlook streetcars. From December 2, 2017, the TTC assigned a minimum of two low-floor accessible Flexity Outlook streetcars on 504 King to handle weekday overcrowding, as the King Street Pilot Project improved service performance and made the service more popular. On January 2, 2018, Flexity Outlook streetcars were introduced on the 504 King route. On October 7, 2018, 504 King was divided into two overlapping branches with two new termini (Dufferin Gate Loop and Distillery Loop) replacing the 514 Cherry route, which was permanently cancelled on the same date. The 304 King Blue Night service remained unchanged. By January 6, 2019, the 504 King route was fully served by Flexity Outlook streetcars. Thus, the TTC designated the route as accessible except along Roncesvalles Avenue where the platform height still needed to be adjusted to allow deployment of the Flexity ramp. On May 9, 2021, the intersection of King Street, Queen Street, The Queensway and Roncesvalles Avenue (KQQR) closed due to various construction projects in the area such as track replacement, reconfiguration of the KQQR intersection, adjusting the height of streetcar loading platforms along Roncesvalles Avenue and upgrades to water, sewer