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| Re: The Washington Metro's 26 TPH limit (1406046) | |||
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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 00:15:26 2016, in response to The Washington Metro's 26 TPH limit, posted by fdtutf on Mon Aug 22 10:27:22 2016. WMATA issues with train through put boils down to two simple facts.Fleet size and traction power. I have been pounding for more then 20 years the fact that WMATA has had rolling stock shortage sense service was extended from National Airport to Huntington on 12 17 1984. For roughly the same amount of time I have stated that the designed specification of the signaling and train control system provides for a through put of 40 train per hour. I have provided this document as Exhibit A of confirmation of that fact. WMATA built out the railroad at a pace greater then the pace that rolling stock was being procured. WMATA's limited fleet size limits the number of revenue ready cars they can make available to fill a time sheet on any given day. The other one is the fact that every rolling stock procurement after the 1k cars was heavier and more power hungry resulting in the over taxing of the traction power distribution system. WMATA addressed that issue in the late 1980s by reducing the top speeds and rates of acceleration, followed by a program to upgrade the kilowatt output of trunk segment traction power substations. That program has yet to be completed. The above combined with the practices related to manual operation hold them back to the 26 train per hour capacity they are allegedly to be limited to. Back in the day before the rolling stock shortage became an issue WMATA routinely operated trains 30 trains per hour. I think the folks at WMATA have collectively forgotten what is need to provide 30 to 40 trains per hour service. I happen to believe that if the fleet were of sufficient size more trains per hour could be run. The number of passengers waiting on platforms to board would reduced and the number of passengers discharging from trains would be reduced along with dwell time because loads would spread among the greater number of trains. John in the sand box of Maryland's eastern shore. |
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