With the amount of money it would cost to add extra tracks to the tunnel, wouldn't it just be better to build a new tunnel elsewhere? Maybe a tunnel under Parc? It may cost a little more to work under a city street, but if it was bored, it shouldn't be that bad, and would also give the option for intermediary stations to serve a dense area, and wouldn't require the existing tunnel to be shut down for a long period of time.
And that's what would be required to widen the tunnel, which would basically require a rebuild, unless you just twinned it with a second bore. But then the case for putting it elsewhere would be even stronger.
As far as the tracks route, I wish they would just kick Via and Amtrak out of Central, and reserve it for metropolitan-area service for REM and AMT, and buy back Parc station and change it back into a train station for out of town service. Parc is in a very central part of town and on a metro line. Not to mention the proposal for a Parc LRT. This is exactly where a number of trips on the St. Jerone line already terminate. And with all the new REM traffic, Central may become a bit congested anyway. Traffic through the station will be more than doubling.
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"The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man." - George Bernard Shaw
Don't ask people not to debate a topic. Just stop making debatable assertions. Problem solved.
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