The City of Toronto hasn't even broken ground on the Scarborough subway, but this beleaguered transit line is already a mess.

Earlier this year, the city decided to move forward with a one-stop plan by extending the Bloor-Danforth line from its current terminus at Kennedy Station up to Scarborough Town Centre. Apparently, this would have freed up money to extend the Eglinton Crosstown LRT eastward into Scarborough.

According to the Globe and Mail, however, the one-stop Scarborough plan will likely cost $900 million more than anticipated, bringing the estimated total cost up to $2.9 billion. That's because building it is going to be much harder than expected.

As the Globe write, some of the new tunnels will have to be deeper than in other parts of the city thanks to Scarborough's topography.

Ridership projections (7,300 people at peak hours by 2031) for this line are not very promising either.

Photo by Adrian Badaraco via the blogTO Flickr pool.