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| Re: WMATA (1312659) | |||
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Re: WMATA |
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Posted by Sand Box John on Sat Sep 13 23:26:39 2014, in response to Re: WMATA, posted by 5119 on Sat Sep 13 21:05:38 2014. Thanks John. do you think WMATA will ever operate in ATO again?Yes. Multiple contracts have been awarded to upgrade the first generation train control hardware to the present generation of hardware. It is my understanding that the Red line could return to automatic operation tomorrow as all of the first generation hardware on that line has been upgraded. Me thinks WMATA is holding off on doing a phased return to automatic operation because they don't want to alienate the folks riding the lines that will be done last. Based on the sequence of the contracts that have been advertized it looks like the upgrades are being done pretty close to the same order the lines originally built, oldest first. The southern Green line and the Blue line east of Addison Road will not need to be upgraded as those segment use hardware almost identical the new stuff that is replacing the old. The upgrades are going beyond what caused the Fort Totten wreck of 06 22 2009. They are replacing the existing relay logic with microprocessor based hardware that emulated relay logic. They are also upgrading selected high frequency track circuits to power frequency track circuits to eliminate the occurrences of loss of detection that was discovered during the testing and acceptance of the train control hardware on the Silver line. John in the sand box of Maryland's eastern shore. |
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