Quote:
Originally Posted by Nouvellecosse
Value engineered platforms to 120m? That's longer than any platform on the Paris and Madrid Metros or Vancouver Skytrain. When and if there comes a day when that's not sufficient capacity will be the day when the city needs another central tunnel to both expand capacity and serve additional parts of the city centre.
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Keep in mind we have low-floor LRT vehicles, so interior configuration is greatly limited by the bogies sticking out of the floor therefore, Vancouver's Expo and Millennium Lines have the same capacity with shorter trains.
That said, the initial design was way over-built. Don't get me wrong. With the current 120 meter platforms, capacity can reach 24,000 phpd. More so if we ever remove driver cabs (4 per 2 car train currently) and/or buy trains that are a continuous 130 meters (overhang at the front and back). That is more than adequate.
The shallower tunnel also saves everyone a whole lot of time getting in and out of stations. Here's a comparison from original deep bored tunnel design to the straight and shallow Queen Street alignment.
https://www.cbc.ca/news/canada/ottawa/ottawa-lrt-tunnel-to-go-under-queen-street-1.1004851
Rideau station was moved east to under Rideau Street about a year later to make it shallower as well, and better serve the Rideau Centre and Byward Market. The depths of the stations as they exist today are, from west to east, 17.5m, 19m and 26.5m.
So value engineering isn't always a bad thing in the case of modifications to the tunnel itself. However, removing the platform screen doors is debatable. Removing the double escalators, I'm quite positive, will cause problems. Parliament station, the busiest on the system, only has two elevators from street level to the concourse, which could also be an issue. The configuration of Bayview station was greatly modified to save money, making possible expansions of the Trillium Line quite awkward (double track, extension to Gatineau, passenger flow between the street, Confederation and Trillium). We shall see.