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So say we want to achieve at least a 5 minute frequencies during the day for Bayshore and Baseline, that means the rest of the Confederation line will have a frequencies of 2.5 minutes.
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I don't think that level of service is warranted. You are suggesting subway service levels for suburban branches.
I believe you can easily have trains every 2 minutes in the tunnel, which means that even with 5 branches, you can still offer 10 minute service on each branch, which is perfectly adequate especially when some of the branching takes place away from the centre of the city allowing more frequent service in central areas where demand warrants it.
I have heard the arguments about high service levels all converging at Bayview allowing easy transfers but that model will either not work or you will require excess capacity west of Bayview. If for example, you had a train every 2.5 minutes on the Confederation Line or 24 trains every hour and a train every 5 minutes from the south and every 5 minutes from Gatineau, that means that 24 trains meet the 24 Confederation Line trains at Bayview. Even if just 50% of the north and south trains capacity transfer to downtown, you will almost certainly have a passenger congestion problem.
Of course, as long as the Trillium Line continues to limp along mostly serving students and the Prince of Wales Bridge continues to rust away serving nobody, this will not be an issue.