Quote:
Originally Posted by Aylmer
I figure that it would cost about half a Scarborough subway 
The way that I see it, it would entail a new crossing of the Rideau river then a rail trench covered by the Nicolas Expressway, not unlike the option currently being pursued for Phase 2 under the Ottawa River Parkway. Past Laurier, you could bore a station under Union. It's a big project, but I don't see it being a tremendously difficult one.
As for having a terminus station, this is something which was possible in Ottawa in 1965 and is still done for passenger trains in Halifax, Vancouver, Toronto and both of Montreal's stations (albeit poorly in the case of Station Centrale).
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Boring a station under an existing building can be done (Stuttgart and Bologna come to mind) but those projects are tremendously difficult.
Ottawa was never a terminal station (tracks continued over the Alexandria bridge). While terminal stations are possible they are a huge pain in the ass - trains waste time driving in and backing out before they can continue on their way.