York Region Transit 301-310

York Region Transit 301-310 are Orion 05.501 built in 2003. These buses were ordered mainly to replace the D40S buses from Markham Transit's express services, and for expansion (especially to express routes). 301-306 had 'Express' stickers on the side before repaint, and 307-310 never carried 'Express' stickers in the first place.

301-306 are normally found on 300 Business Express, 301 Markham Express, 302 Unionville Express, 303 Bur Oak Express, 304 Mount Joy Express, and school specials during weekday rush hours only. 307-310 are normally found on 5 Clark, 7 Martin Grove, 12 Pine Valley, 13 Islington, 21 Vellore Local, 23 Thornhill Woods, 26 Maple Local, 87 Autumn Hill, and school specials during weekday rush hours only.

Details
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 * colspan=2 align=center| York Region Transit active fleet