Actually to be truthful, not really. It's already there as subway so you may as well just leave it there as subway. It's just that I don't quite understand why it was built in the first place.
It's easy to understand when you understand the history and the plans for Metro Toronto. Plans for a Sheppard subway long predate Mel Lastman's political meddling.
Metro's growth plans in the 70s and 80s called for intensification and jobs growth to occur in the centres of the inner suburbs (North York Centre, Scarborough Centre, etc...), and not in the central area (former City of Toronto) where the local politicians opposed major intensification.
As such, the question was "where is the best place in the
inner suburbs to build a new subway?". Also, the need for a new crosstown route was clear. Sheppard was an extremely busy route for buses and it is easy to understand why.
Sheppard, from Dufferin to Scarborough Centre serves:
- The two largest inner suburban "centres"
- 5 shopping malls (which like it or not, are the "main streets" of postwar development)
- 3 major employment zones
- A major hospital
- Numerous tower blocks
If Sheppard is not the most densely populated corridor in the inner suburbs, it's definitely in the top 3.
So that's where they identified the optimal location for a crosstown route. No other potential corridor could compare in terms the combination of jobs, ridership, population, destinations, crosstown-ness, and growth potential.
People often talk about Eglinton being a superior choice, but as unimaginative pointed out, studies at the time didn't even suggest a subway for Eglinton as ridership wasn't high enough. An Eglinton crosstown subway would definitely help a lot of people get around (including me), but frankly it has no major trip generators between Yonge and the Airport. It's just an urban street which happens to go across the entire city, through each former borough, right in the middle. Between Yonge and Markham Rd fares a bit better for trip generators but has even lower ridership than Eglinton West because people are drawn south to the Danforth line, as well as low-density Don river parkland and big-box retail along the route.
We need to remember that the Sheppard subway moved an average of 45,860 people over its 5.5km length (8338 passengers per km) last year. The only surface routes that come close to the total number of riders are the 504 King (12.8km, 3742 passengers per km) and the 29 Dufferin (12.2km, 3574 passengers per km). And as Scarberian would point out, these routes are bisected by subways making them more like 2 routes. Current ridership per km for Eglinton West is around 1000 passengers per km.
Simply, with regards to the Sheppard subway:
- It made sense at the time it was planned due to Metro's official plan, it makes sense today due to Toronto's official plan.
- It made sense at the time it was planned due to existing ridership, and it makes sense today due to existing ridership.
- It made sense at the time due to the need for a rapid crosstown route in the north of the city, and Toronto still needs a a rapid crosstown route in the north of the city.
- It made sense at the time due to population and employment density, and it makes even more sense today due to population growth and employment.