It’s taken quite a few public transit infrastructure improvements to make Toronto’s more reliable in snowfall.

Trams used relatively unreliable trolley poles instead of pantographs until ~10 years ago.

Most of the tram network “street runs”, so slow automobile traffic slows them down.

Bicycle lanes become snow dumps when it snows a lot. There has at least been a more recent push to clear them of snow somewhat regularly at least instead of abandoning them entirely for maintenance.

The metro/subway still runs largely above-ground.

Lots of gas/electric train switch heaters installed on the regional train network but it can still fall apart in a snowstorm.