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| Re: The Washington Metro's 26 TPH limit (1406024) | |||
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Re: The Washington Metro's 26 TPH limit |
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Posted by WillD on Mon Aug 22 19:26:22 2016, in response to The Washington Metro's 26 TPH limit, posted by fdtutf on Mon Aug 22 10:27:22 2016. That seems like a pretty straightforward choice to make. They're currently choosing to play it safe and have a large margin between successive trains. But that's killing their capacity. Surely they should consider a reduction to the operating margin (this time not modifying the dwell time) to enable a greater capacity while accepting the possibility that a greater number of trains will run late. Unfortunately management tends to prefer performance metrics that can be easily digested. On time performance is key among these and many systems will try to improve OTP even if it results in no real improvement in service. It's easy to say "we had 90% of our trains on time this quarter!" and a lot harder to point to an increase in seats through a given station per hour at the same time OTP suffers.Of course before they can choose to reduce the operating margin and increase the number of trains per hour they'd have to have the cars to run those trains. Not only would they need more cars, but their OTP would suffer the least if they had trains standing by to make trips as required from terminal points so latenesses don't cascade across the system. Unfortunately I don't believe WMATA is anywhere near that point. |
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