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Yes, a platform over 3 times as long will cost roughly 3 times as much. Its 3 times larger. you have to excavate 3 times the area, pour 3 times the concrete, etc. Stations in Toronto cost around 100 million. Most Vancouver stations don't have extensive bus terminals like Toronto as well. The only station without a bus terminal is Downsview Park and York University. Finch West will have 4 bus bays, Pioneer village will have over 20, Highway 407 will have 17, and Vaughan centre will have around 10.
The LRT in Scarborough would have largely run elevated and on the surface. only 800 meters of the 10. km line was underground. Metrolinx looked at replacing it line for line with a subway, and it cost just as much to build a 10km line that is elevated, on the surface, and less than a km underground as it did to build the completely underground version.
architecture is subjective.
Toronto's subway system is also rather unique in the fact that it is completely built off of feeder bus networks, immediate density around the stations serves little purpose for ridership but rather the ridership of the buses feeding it, of which the spadina and scarborough extensions have plenty.
http://www.urbantoronto.ca/news/2013/11/...washington-san-francisco-bay-and-toronto