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| Re: LIRR: Third rail vs. catenary (335338) | |||
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Re: LIRR: Third rail vs. catenary |
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Posted by WillD on Tue Nov 7 15:46:51 2006, in response to Re: LIRR: Third rail vs. catenary, posted by Olog-hai on Mon Nov 6 18:45:55 2006. The Miami system was pretty much laid out in a cookie cutter with the Baltimore metro system. If you look at the aftermath of typhoons which strike Japan most of the time phone and power lines are down, but the more robust overhead catenary is left standing. The wind loading on the wires isn't that great, the towers are built to be a good deal stronger than the power poles, and on constant tension installations the movable weight serves to absorb sudden gusts and even debris impacts.However, there are subways which use 25kv AC wire, for one thing the Athens Metro Line 3, which does a dual voltage 750vdc, 25kvAC system. |
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