This is a ride on GO Transit 8542, a 2020built Alexander Dennis Enviro 500 'SuperLo' equipped with a Cummins L9 engine and an Allison B500R 6speed transmission.
In this video 8542 is operating a route 54 from Hwy 407 Station to Mount Joy GO, via Unionville and Markham. Filmed in the morning on March 22nd, 2023.