proper and makes connections between all train lines. There are also routes that serve Pearson International Airport, seasonal destinations such as several colleges and universities. The vast majority of GO train stations have connecting GO bus service, of which almost all the exceptions are situated within Toronto proper. There are also 16 bus terminals served by GO buses, many of which provide local transit connections, as well as intermediate stops and ticket agencies. The first buses operated by GO Transit, a suburban variant of the GM New Look bus, were unveiled at Queen's Park on August 11, 1970, about a month before commencing operations on its expanded services east, west and north of Toronto. Operated by Gray Coach, a pilot program to test them was conducted in Pickering before they entered service on 8 September 1970. Later buses included a combination of single-door, suburban-type transit buses built by Orion Bus Industries and New Flyer, and single-level highway coaches built by Prevost Car and Motor Coach Industries (MCI, now a subsidiary of New Flyer). Today, GO Transit operates a combination of single-level coach buses and commuter-type double-decker buses. All buses are equipped with bike racks and are wheelchair accessible. Most of the older buses in the fleet are , single-level D4500CT coach buses built by Motor Coach Industries, which can seat 57 people and features a platform lift. The first models of this type entered service in 2001 and orders have continued until 2015. In April 2008, GO began operating Enviro 500 double-decker buses built by British manufacturer Alexander Dennis in the United Kingdom. These buses come in three different designs differing mainly in their size and height. All double deckers have a low-floor design and a wheelchair ramp at the front door. The first two batches of double deckers have a height of , too tall to meet many height standards set by the provincial Ministry of Transportation. Thus, they are restricted to routes which avoid low bridges and underpasses. In particular, they are found exclusively on routes on the Highway 407 and Highway 403 corridors, providing service between Peel and York Regions. In 2012, GO ordered new Enviro500 double-decker units for its fleet. Designated as "Go-Anywhere" models, they have a redesigned front end, based on the Enviro400 (and which would later form the basis for the global Enviro500 MMC refreshed design), and a height of , lower than the