In 2015, Go Transit ordered 250 "SuperLo" Enviro500s at 13.7-metre length but with even lower height of 3.9 metres, allowing them to fit into terminals with height restrictions, particularly York Mills and Yorkdale Terminals. The first batch of 38 vehicles (8300-8337) was delivered in 2016. The chassis for these vehicles are being manufactured at a purpose-built factory near Toronto, creating up to 30 new full-time jobs. As a suburban bus operator, the Enviro500 has single doors at the front.

Strathcona County Transit received five Enviro500s in 2016.

https://www.revolvy.com/main/index.php?s=Alexander%20Dennis%20Enviro500&item_type=topic

Alexander Dennis produced another version of the Enviro500 in 2016. The "Super-Lo" Enviro500 was developed at the behest of Metrolinx and has a lower height than the "Go-Anywhere" version. At 3.9 metres, it will be able to fit in GO Transit's Hamilton, Yorkdale, York Mills, and Union Station bus terminals. The "Super-Lo" Enviro500 is also 13.8 metres long and has the rear half of the lower deck reserved for luggage.

Metrolinx agreed to purchase 253 "Super-Lo" buses over a five-year period with an option for 150 more. As part of the agreement, a chassis assembly facility was constructed in the Greater Toronto and Hamilton Area.

https://cptdb.ca/wiki/index.php/Alexander_Dennis_Enviro500