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| Re: LIRR: Third rail vs. catenary (334800) | |||
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Re: LIRR: Third rail vs. catenary |
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Posted by AEM-7AC #901 on Mon Nov 6 14:54:28 2006, in response to Re: LIRR: Third rail vs. catenary, posted by RonInBayside on Mon Nov 6 14:22:05 2006. Is it because all these transportation systems are run by low-grade morons who need help learning how to trip over themselves and most importantly, refuse to hire WillD to design their power systems?One of the reasons that third rail continues to be used in many urban transit system applications is because of tunnel clearances. To shave off some dollars in construction, the tunnels are designed with smaller clearances. Just as a side point, the with the exception of two lines, the Tokyo subway system uses a 1500vdc catenary system, and that's for one of the most used subway systems in the world. IIRC, when the RER in Paris was constructed, some of the 600VDC third rail lines were converted to 25kV @ 60hz. Also, IIRC, there are provisions for pantographs for MBTA's Orange Line fleet and the N-5s for SEPTA. As for why those lines were never converted, I won't speculate, and I'll leave the question open to anybody with a proper answer. |
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