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Re: Fourth Rails and Safety |
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Posted by Chris R16/R2730 on Sun Sep 13 12:12:53 2009, in response to Re: Fourth Rails and Safety, posted by Bill West on Fri Sep 11 21:53:29 2009. 2c. Lionel track is 2 running rails and the "third" rail in the middle, there is only one voltage. It's not grounded either. IIRC the Lionel track has the middle rail as positive and the two outside rails as negative, to prevent potential shorts at track junctions. |
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Re: Fourth Rails and Safety |
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Posted by R36 #9346 on Sun Sep 13 12:15:53 2009, in response to Fourth Rails and Safety, posted by Subterranean Railway on Fri Sep 11 11:05:08 2009. Check the One Unders page on Tubeprune. |
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Re: Fourth Rails and Safety |
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Posted by Subterranean Railway on Sun Sep 13 12:15:56 2009, in response to Re: Fourth Rails and Safety, posted by R36 #9346 on Sun Sep 13 12:09:49 2009. Nominally, yes. Voltage fluctuates so much on the LU that such figures are approximate at best. |
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Re: Fourth Rails and Safety |
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Posted by Subterranean Railway on Sun Sep 13 12:19:49 2009, in response to Re: Fourth Rails and Safety, posted by R36 #9346 on Sun Sep 13 12:15:53 2009. Nice read, thanks for the link! Maybe I'll contact TFL and ask about electrocution statistics, since that article merely dealt with people being struck. |
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Re: Fourth Rails and Safety |
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Posted by Chris R16/R2730 on Sun Sep 13 12:20:12 2009, in response to Re: Fourth Rails and Safety, posted by Wado MP73 on Fri Sep 11 21:35:53 2009. Besides LU, is there any other mass transit system which uses this same system? I can't think of any. |
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| (832972) | |
Re: Fourth Rails and Safety |
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Posted by Subterranean Railway on Sun Sep 13 12:20:56 2009, in response to Re: Fourth Rails and Safety, posted by Bill West on Sat Sep 12 21:20:46 2009. If someone got through the fence we didn’t try to regulate the degree of defenses inside, we’d already failed.I completely agree. However, as I said before, it's considerably easier to accidentally end up on the roadbed than to "accidentally" end up in a substation. Since the potential for accidents in a subway is fairly high, it makes sense to take as many practical safety precautions as possible. then don’t debate the sharpness of glass, debate ways to keep people from falling. ie platform door systems. Prevention is a whole other issue. My intent for this thread was merely to evaluate the danger of center-running electrified rail. |
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| (832974) | |
Re: Fourth Rails and Safety |
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Posted by Subterranean Railway on Sun Sep 13 12:23:12 2009, in response to Re: Fourth Rails and Safety, posted by Chris R16/R2730 on Sun Sep 13 12:20:12 2009. Line M1 in Milan. |
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| (832978) | |
Re: Fourth Rails and Safety |
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Posted by Fytton on Sun Sep 13 12:27:46 2009, in response to Re: Fourth Rails and Safety, posted by Subterranean Railway on Sat Sep 12 02:53:42 2009. 'IINM, the fourth rail was implemented in the 1890s'The only deep tube line opened before 1900 was the City and South London Railway (now part of the Northern Line). The Central London Railway (now Central Line) opened in 1900. Neither of these became part of the Yerkes (London Electric Railways. or 'UndergrounD') empire until later, after Yerkes' death. Neither of these two early tubes used fourth-rail return: both had overrunning conductor rails between the running rails, with return through the running rails. This contrasts with the system still used on the former Southern Railway suburban lines, which have overruning third rails outside the running rails, the present Underground system with a central fourth rail for return, and the DLR system which has underrunning conductor rails! |
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| (833151) | |
Re: Fourth Rails and Safety |
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Posted by Wado MP73 on Sun Sep 13 20:13:03 2009, in response to Re: Fourth Rails and Safety, posted by Fytton on Sun Sep 13 12:27:46 2009. The only deep tube line opened before 1900 was the City and South London RailwayYou are forgetting the Drain, which opened in 1898. It also used centred third rail at first. I got my dates mixed up a bit too. The first four rail electrification of the Met was in 1905, while the Bakerloo opened the next year in 1906, not the other way around. But I'm rather sure Yerkes also thought about his new tube lines when he chose a four rail system. IIRC, the Great Northern originally used a four rail system with both of the conductive rails on the outside. A similar system was tested on the District around High St. Kensington. |
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| (833413) | |
Re: Fourth Rails and Safety |
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Posted by Wado MP73 on Mon Sep 14 11:37:33 2009, in response to Re: Fourth Rails and Safety, posted by Subterranean Railway on Sun Sep 13 12:23:12 2009. It's not the same configuration though. |
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Re: Fourth Rails and Safety |
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Posted by Bill West on Tue Sep 15 02:32:41 2009, in response to Re: Fourth Rails and Safety, posted by Wado MP73 on Mon Sep 14 11:37:33 2009. Vancouver's Skytrain uses 4th rail, mounted one above the other outside the running rails.When I saw it the safety signs on the platform alleged that there was an intrusion detection system for the track area. Don't know if this was a bluff or for real, nor what it did if it went off. Bill |
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