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| Re: WMATA: Dulles Corridor Metrorail Project Pictures 04 15 2012 (1152050) | |||
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Re: WMATA: Dulles Corridor Metrorail Project Pictures 04 15 2012 |
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Posted by Sand Box John on Fri Apr 20 00:00:57 2012, in response to Re: WMATA: Dulles Corridor Metrorail Project Pictures 04 15 2012, posted by orange blossom special on Thu Apr 19 18:51:41 2012. I can't figure out if it's nice that it doesn't look like they're skimping at all, or if this looks like a really excessive build.They skimped big time. All of the traction power substation will have a 6 MW output, WMATA would have desired 9 MW, they are built with provision to increase output to 9 MW at a later date. The train control and signaling system along route is built to accommodate 195 second headways instead of the typical 90 second headway. All of the stations will have roughly 1/3 fewer escalators compared to what was originality planed based on projected peak passenger flow through the stations. There will be 2 elevators between the various level for redundancy, prior to the opening of the G Route Blue line extension, station were built with a minimum of 1 elevator between the various levels. 2 pocket tracks were deleted and replaced with double crossover that would have allow greater operational flexibility. All of the cabling for communication, train control and 120V AC power will be installed in surface cable tray inclosures instead buried concrete ducts banks that is typical elsewhere on the railroad. The abundant use of architectural precast concrete in some of the elements looks to my eye to be an elegant improvement compared to massive poured in place structures of similar type found elsewhere on the railroad. John in the sand box of Maryland's eastern shore. |
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