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| WMATA article on Wikipedia - need clarification (108519) | |
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| (108519) | |
WMATA article on Wikipedia - need clarification |
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Posted by SchuminWeb on Tue Jul 5 22:15:43 2005 We're looking to clarify some information on the Wikipedia article on WMATA, in advance of nominating the article for a main-page feature.What we're looking to clarify is this statement, under "Signalling and Operation": At switches entering into pocket tracks in a direction reverse to the normal operating dirction, there is a "P Signal", which in its lit state allows the operator to manually set the switch and enter the pocket track. Any help you all can provide would be appreciated. Also feel free to edit the article as necessary for clarity and accuracy. Ben F. Schumin :-) |
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| (108523) | |
Re: WMATA article on Wikipedia - need clarification |
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Posted by ALSTOM R160A on Tue Jul 5 22:17:11 2005, in response to WMATA article on Wikipedia - need clarification, posted by SchuminWeb on Tue Jul 5 22:15:43 2005. Wow, that is WAY off. |
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| (108549) | |
Re: WMATA article on Wikipedia - need clarification |
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Posted by Richard Rabinowitz on Tue Jul 5 22:27:43 2005, in response to Re: WMATA article on Wikipedia - need clarification, posted by ALSTOM R160A on Tue Jul 5 22:17:11 2005.  (Image from Wikipedia at http://upload.wikimedia.org/wikipedia/en/thumb/b/b6/I22913-2004Nov03L.jpg/250px-I22913-2004Nov03L.jpg) |
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| (108554) | |
Re: WMATA article on Wikipedia - need clarification |
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Posted by ALSTOM R160A on Tue Jul 5 22:28:55 2005, in response to Re: WMATA article on Wikipedia - need clarification, posted by Richard Rabinowitz on Tue Jul 5 22:27:43 2005. Uh huh...and that is related to my post How? |
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| (108561) | |
Re: WMATA article on Wikipedia - need clarification |
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Posted by David of Broadway on Tue Jul 5 22:31:27 2005, in response to Re: WMATA article on Wikipedia - need clarification, posted by ALSTOM R160A on Tue Jul 5 22:28:55 2005. It's also way off. |
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| (108638) | |
Re: WMATA article on Wikipedia - need clarification |
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Posted by WMATAGMOAGH on Tue Jul 5 23:01:59 2005, in response to WMATA article on Wikipedia - need clarification, posted by SchuminWeb on Tue Jul 5 22:15:43 2005. E-mail John. He has explained it to me before I think. |
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| (108648) | |
Re: WMATA article on Wikipedia - need clarification |
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Posted by Richard Rabinowitz on Tue Jul 5 23:09:57 2005, in response to Re: WMATA article on Wikipedia - need clarification, posted by David of Broadway on Tue Jul 5 22:31:27 2005. Indeed, it's the very image of way off. |
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| (108945) | |
Re: WMATA article on Wikipedia - need clarification |
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Posted by Sand Box John on Wed Jul 6 11:41:51 2005, in response to WMATA article on Wikipedia - need clarification, posted by SchuminWeb on Tue Jul 5 22:15:43 2005. We're looking to clarify some information on the Wikipedia article article on WMATA, in advance of nominating the article for a main-page feature.What we're looking to clarify is this statement, under "Signalling and Operation": At switches entering into pocket tracks in a direction reverse to the normal operating dirction, there is a "P Signal", which in its lit state allows the operator to manually set the switch and enter the pocket track. Any help you all can provide would be appreciated. Also feel free to edit the article as necessary for clarity and accuracy. The author over simplified the description of the "P Signal". The P Signal is a single lunar signal that displays the letter "P" and is found at the entrance to some but not all pocket tracks and other selected main line interlockings in the reverse direction of the normal flow of traffic. Below the P signal on the same post is a punch box to allow the train operator to manually set the switch to the diverting direction (reverse) when the P Signal is lit. The P signal is only lit when a train occupies the two track circuit approaching the P Signal and all possible routes into the interlocking are not occupied. You may use this description verbatim if you wish. The information is from one of the volumes of the signal maintainers manuals prepared by GRS for WMATA back in the 1970s. I have no idea if the P signals and punch boxes are still operational. The last time I saw a P signal lit was at the south end of the Farragut North (A02) pocket track interlocking on track A1 on my 25th anniversary trip on the Red Line back on 03 27 2001. John in the sand box of Marylands eastern shore. |
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| (109288) | |
Re: WMATA article on Wikipedia - need clarification |
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Posted by Sand Box John on Thu Jul 7 00:55:18 2005, in response to Re: WMATA article on Wikipedia - need clarification, posted by Sand Box John on Wed Jul 6 11:41:51 2005. I was in a hurry this morning when I composed the P Signal post description.I left out the fact that after the operator sets the route in the punch box at the P signal the operator can only proceed when the normal interlocking signal displays a lunar aspact. John in the sand box of Marylands eastern shore. |
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| (109677) | |
Re: WMATA article on Wikipedia - need clarification |
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Posted by SchuminWeb on Thu Jul 7 16:53:49 2005, in response to Re: WMATA article on Wikipedia - need clarification, posted by Sand Box John on Thu Jul 7 00:55:18 2005. Thanks! Greatly appreciated.Ben F. Schumin :-) |
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| (110377) | |
Re: WMATA article on Wikipedia - need clarification |
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Posted by Sand Box John on Sat Jul 9 01:03:56 2005, in response to Re: WMATA article on Wikipedia - need clarification, posted by SchuminWeb on Thu Jul 7 16:53:49 2005. Thanks! Greatly appreciated.If you like I can dig out the signal maintainers manual and transcribe the pertinent text related to the P Signal. I will have to dig out and install my scanner to scan the drawings of the P signal and punch box. John in the sand box of Marylands eastern shore. |
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| (110401) | |
Re: WMATA article on Wikipedia - need clarification |
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Posted by RonInBayside on Sat Jul 9 06:01:30 2005, in response to Re: WMATA article on Wikipedia - need clarification, posted by Sand Box John on Thu Jul 7 00:55:18 2005. "I left out the fact that after the operator sets the route in the punch box at the P signal the operator can only proceed when the normal interlocking signal displays a lunar aspact."So the operator first sees a lunar aspect, then sees a lit P which he then punches to open the pocket track or reverse route to his/her train. Is that right? |
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| (110512) | |
Re: WMATA article on Wikipedia - need clarification |
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Posted by Sand Box John on Sat Jul 9 13:49:25 2005, in response to Re: WMATA article on Wikipedia - need clarification, posted by RonInBayside on Sat Jul 9 06:01:30 2005. So the operator first sees a lunar aspect, then sees a lit P which he then punches to open the pocket track or reverse route to his/her train. Is that right?No, The normal interlocking signal will be displaying red over red. The P Signal will be lit only when the train is occupying the track circuits before the P Signal. The lunar aspect will only be displayed on the interlocking signal after the train operator punches in the desired route and the interlocking plant sets and locks the switches. The P Signal is total separate from the normal interlocking signal. The signal is mounted on top of its own post with the punch box mounted on the side of the post. The location of the P Signal is around 20’ (6 m) before the interlocking signal and is always on the cab side of the track when facing the signal. John in the sand box of Marylands eastern shore. |
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| (110556) | |
Re: WMATA article on Wikipedia - need clarification |
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Posted by RonInBayside on Sat Jul 9 19:40:29 2005, in response to Re: WMATA article on Wikipedia - need clarification, posted by Sand Box John on Sat Jul 9 13:49:25 2005. Thank you.I think the source of my confusion is this: I'm trying to picture the train's operator looking through his cab window at this linar aspect. But you said that this applies also to trains running in reverse. So the "normal signal" is facing the other way. But this is the "red over red" facing the opposite direction from the normal flow of trains on that track. A I getting close? |
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| (110572) | |
Re: WMATA article on Wikipedia - need clarification |
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Posted by Sand Box John on Sat Jul 9 20:56:45 2005, in response to Re: WMATA article on Wikipedia - need clarification, posted by RonInBayside on Sat Jul 9 19:40:29 2005. I think the source of my confusion is this: I'm trying to picture the train's operator looking through his cab window at this linar aspect. But you said that this applies also to trains running in reverse. So the "normal signal" is facing the other way.But this is the "red over red" facing the opposite direction from the normal flow of trains on that track. Sorry for the confusion, when I used the phrase "normal interlocking signal" I was referring to any signal that protects any switch at the entrance to any interlocking regardless of direction of travel. Here is an ASCII art layout of the all of the signals in the A02 interlocking at Farragut North. John in the sand box of Marylands eastern shore. |
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| (110575) | |
Re: WMATA article on Wikipedia - need clarification |
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Posted by RonInBayside on Sat Jul 9 21:23:55 2005, in response to Re: WMATA article on Wikipedia - need clarification, posted by Sand Box John on Sat Jul 9 20:56:45 2005. Thanks, John. That was helpful. My confusion is gone.I've boomarked your website for future reference. |
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