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| Re: Full CBTC Shut Down Last Night (834012) | |||
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Re: Full CBTC Shut Down Last Night |
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Posted by WillD on Tue Sep 15 17:20:58 2009, in response to Re: Full CBTC Shut Down Last Night, posted by arnine on Tue Sep 15 16:58:26 2009. Well, IMHO it just isn't safe here to do it.Why? Specifically. What is it about the NYCT system that makes it any different from London, Paris, Berlin, Philadelphia, or any of the other legacy systems that have upgraded to OPTO? And before someone brings it up the merges and so on are a non-issue because the C/R is of no assistance in sorting through the junctions. Honestly, it should not be done from the sfaety viewpoint. What is any less safe with having a T/O operate the doors? At many stations the C/R is already viewing the platform through a closed circuit TV system. Where is the problem with simply having the T/O view those same TVs and push the button? I'd argue that we don't even need anyone pressing a button to close the doors. The RUBIN ZPTO system in Nuremburg incorporates an automatic door closing system which has been found to be superior to the operator closed doors on the city's other two lines. The U3, the U-bahn line which uses the RUBIN system, also merges and diverges from the city's U2 subway line, which was built in the 1950s and uses conventional OPTO cars without an ATC system. Thus the ZPTO DT3s on the U3 are operating in the same traffic as the operator driven DT1s and DT2s on the U2, with the U2 operators obeying the same signal system they've had since the line opened in the 1950s, and that signal system is functionally the same as NYCT's system. OPTO shouldn't be done on trains longer than 4 cars. Why? DC runs 600 foot long OPTO trains. Philadelphia has the capability to operate nearly 540 foot long OPTO trains, without any sort of CBTC, ATO, or other cab signalling system. The Widecab arrangement is a severe problem when it comes to station dwell times, but as the Market Frankford line readily demonstrates the CCTV system can easily have the monitors placed in the cab to eliminate the walk across the platform. |
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