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| Re: The Washington Metro's 26 TPH limit (1406081) | |||
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Re: The Washington Metro's 26 TPH limit |
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Posted by Sand Box John on Tue Aug 23 10:42:29 2016, in response to Re: The Washington Metro's 26 TPH limit, posted by fdtutf on Tue Aug 23 10:19:36 2016. This limit was put to the test in 2000 where, in response to the “Orange Crush”, Metro scheduled 29 trains per hour (19 Orange, 10 Blue) through the Rosslyn portal. However the aggressive 29 trains per hour (125 second headways) schedule was rarely achieved even with a mix of shorter 4- and 6-car trains, which tend to favor close headway operation. This was primarily due to tight operating margins and unattainable dwell times, scheduled at 12 seconds outside, and 19-23 seconds inside the core (far lower than the study’s recommended 40 seconds).What's your analysis of this, John? Redeploy rolling stock from the Green Red and Yellow lines to allow the running of 100 percent 8 car trains and run the test again. Me thinks they will have no trouble reducing the dwell times needed to discharge and board trains. They may not reach the the goal of 12 seconds outside, and 19-23 seconds inside the core but they will be a hell of a lot closer to what is being experienced today. John in the sand box of Maryland's eastern shore. |
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