I think the original point of this thread is to have a fantasy scenario where the City of Scarborough had its own transit system, the Scarborough Transit Commision or Scarborough Transit, which developed independently from the City of Toronto and the surrounding cities/boroughs. The TTC would not have Bloor-Danforth Line past Victoria Park, which will become what Kennedy Station is now, but with 2 separate bus terminals (no fare integration) and Sheppard Line might actually have been built to Victoria Park.
The transit of SCT (Scarborough Transit) would probably be LRTs on Victoria Park, Morningside, and Eglinton/Kingston. Subways on Sheppard, McCowan, and connection to Victoria Park Station. Then BRTs on the rest of the Arterials.
This is just my idea of how the City of Scarborough and SCR would develop if it was part of neither Toronto nor the TTC.
Toronto's policy on Subway extension seems to be NOT to build it to City boundary - that would only subsidize 905-ers,... (Spadina subway extension was Provincial and extremely political).
The reality is while Scarborough makes up 1/3 of Toronto's land mass,...
most Torontians (outside of Scarborough) would be better off if Scarborough actually de-amalgamate!
- Scarborough is mostly low density houses which are costly to service VS high density condo towers which generate much more property tax revenue for City per land area (that's why City of Toronto and every 905 hick-town is doing intensification)
- Higher demographic of non-English speaking population is more costly to service
- Scarborough is mainly priority, lower and middle income bracket that contribute lower to City revenue stream (property tax)
Property tax revenue from most Torontonians (especially higher density area of Toronto outside of Scarborough) are likely subsidizing high cost of all the City services demanded by Scarborough!
The original Bloor-Danforth subway terminated at Woodbine; the main reason for it's extension eastward past VictoriaPark (boundary with Scarborough) along with Scarborough RT was Metropolitan Toronto's desire to connect all the borough's City Halls (City Centres). Thus, without Toronto, Scarborough likely wouldn't have any subway station or LT line.
A comparison of Scarborough with other non-Toronto GTA 905 municipalities, in terms of density, built form, land use, income level (city's property tax revenue), etc,...
would show Scarborough is closer to Pickering-Ajax & Brampton than RichmondHill, Markham, Mississauga and Vaughan.
Thus, one would expect the transit system of a de-amalgamated Scarborough would be able to afford would be similar to those of Pickering-Ajax & Brampton,... only local bus service with infrequent service. Any bus service cross border would be GO-bus service or local municipality paying (subsidizing) TTC for TTC bus route going a few km east of Victoria Park Ave into
Scarberia.
The construction of transportation infrastructures (subways lines, LRT lines, Bus-RT lines) are generally heavily subsidized by the government of Ontario and is extremely political; since Scarborough tend to vote for all 3 parties,... good luck to de-amalgamated Scarborough convincing the Ontario government in power to finance any of these higher level of transit.