YRT portion of the journey is paid with a co-fare). TTC services in York Region Buses Some TTC bus routes travel into York Region and operate on behalf of YRT. This allows passengers to board a TTC bus in York Region and disembark in the City of Toronto and vice versa. Passengers crossing the Toronto–York boundary at Steeles Avenue on a TTC bus must pay an additional fare: a YRT fare is required for travel north of Steeles Avenue and a regular TTC fare for travel south of it. Certain YRT routes enter Toronto, but City of Toronto regulations mean that passengers may not board inbound (towards Toronto) or disembark on outbound (away from Toronto) YRT routes in Toronto. No extra fare is charged for travel solely on YRT vehicles in Toronto. Since August 26, 2019, riders have been able to use their Presto card to pay both their YRT and TTC fares on TTC-operated bus routes that travel between York Region and Toronto. While single-use TTC paper Presto tickets can be used to pay a TTC fare for the subway (whether in York Region or Toronto) or TTC surface routes in Toronto, they cannot be used to pay a YRT fare on any YRT or TTC-operated bus routes in York Region. Subway On December 17, 2017, the western branch of Line 1 was extended into York Region. Coinciding with that opening, YRT took over the operation of four TTC-operated routes in Vaughan. Unlike the policy with TTC-operated bus routes north of Steeles, no extra fare is charged when boarding or disembarking at and Vaughan Metropolitan Centre stations in Vaughan, due to the impracticality of a payment-on-exit system. However, an additional fare is required when transferring between YRT bus routes and the TTC subway at these stations, as it is at stations located in or bordering Toronto, such as or as well as with other TTC bus routes operating south of Steeles Avenue in Toronto including those aforementioned subway stations where TTC buses connect with. Brampton Transit fares in York Region An agreement between YRT and Brampton Transit means passengers boarding Züm Queen east of Highway 50 (which largely duplicates service with Viva Orange while in York Region) will be assessed YRT fares even if they intend to disembark in Brampton. As a Brampton Transit route, Brampton Transit fare media (including those loaded onto a Presto card) may be used