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| L train’s CBTC system meltdown (1640751) | |
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| (1640751) | |
L train’s CBTC system meltdown |
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Posted by Gold_12th on Tue Apr 15 15:01:46 2025 No service in Brooklyn due to “technical issue” on the signaling system. |
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| (1640767) | |
Re: L train’s CBTC system meltdown |
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Posted by W.B. on Wed Apr 16 06:32:19 2025, in response to L train’s CBTC system meltdown, posted by Gold_12th on Tue Apr 15 15:01:46 2025. One of those things where people are scratching their heads wondering why the MTA never kept old-style "block signalling" as a backup should there be any "glitches" in the CBTC system. |
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| (1640770) | |
Re: L train’s CBTC system meltdown |
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Posted by Jersey Mike on Wed Apr 16 08:19:16 2025, in response to Re: L train’s CBTC system meltdown, posted by W.B. on Wed Apr 16 06:32:19 2025. They did. NYCTA can run 12tph on the line with 1 train in each section between interlockings. If the CTC code line went down that's a different problem. |
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| (1640773) | |
Re: L train’s CBTC system meltdown |
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Posted by Stephen Bauman on Wed Apr 16 08:40:33 2025, in response to Re: L train’s CBTC system meltdown, posted by Jersey Mike on Wed Apr 16 08:19:16 2025. NYCTA can run 12tph on the line with 1 train in each section between interlockingsThe spec is 3 tph for the Auxiliary Wayside System (AWS). It's designed for night operation, when non-CBTC equipment can be on the line for maintenance. |
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| (1640774) | |
Re: L train’s CBTC system meltdown |
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Posted by Chris R16/R2730 on Wed Apr 16 08:50:38 2025, in response to Re: L train’s CBTC system meltdown, posted by Stephen Bauman on Wed Apr 16 08:40:33 2025. Running that during rush hour would be worse than shutting it down. |
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| (1640779) | |
Re: L train’s CBTC system meltdown |
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Posted by Stephen Bauman on Wed Apr 16 12:05:00 2025, in response to Re: L train’s CBTC system meltdown, posted by W.B. on Wed Apr 16 06:32:19 2025. One of those things where people are scratching their heads wondering why the MTA never kept old-style "block signalling" as a backup should there be any "glitches" in the CBTC system.They did for a while, until they were convinced all the glitches were out. After that the old backup block system was removed. Keeping a full time block system would mean twice the cost - two systems instead of one. Implementing CBTC was already more expensive than replacement of a block system using modern components. Building two systems: CBTC plus a replacement block system would have raised questions. You may start experiencing more CBTC failures on the 14th St Line. Electronic parts have a much shorter lifespan than relays. It's not that they are unreliable. Rather newer parts make them obsolete and finding exact replacements becomes impossible. That lifespan is around 25 years. The 14th St Line's CBTC is nearing the end of its useful life. The same goes for the electronics in the R142's and R143's. Their internal wiring used LON Works. It was obsolete, when it was specified. Finding spare parts will become increasingly more difficult. |
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| (1640786) | |
Re: L train’s CBTC system meltdown |
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Posted by Steve B-8AVEXP on Wed Apr 16 13:51:02 2025, in response to L train’s CBTC system meltdown, posted by Gold_12th on Tue Apr 15 15:01:46 2025. Now it's Larry's turn to be a victim of soicumstance. |
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| (1640791) | |
Re: L train’s CBTC system meltdown |
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Posted by Railman718 on Wed Apr 16 16:52:42 2025, in response to L train’s CBTC system meltdown, posted by Gold_12th on Tue Apr 15 15:01:46 2025. Ahh i dont miss those days in Queens when CBTC acting up basically has everyone stopping and staying while they figure out what to do... |
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| (1640801) | |
Re: L train’s CBTC system meltdown |
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Posted by Jersey Mike on Thu Apr 17 09:07:37 2025, in response to Re: L train’s CBTC system meltdown, posted by Stephen Bauman on Wed Apr 16 12:05:00 2025. Its no different than any other system that implements cab signals without wayside signals. If there's a cab signal (CBTC) failure they can run one train per section. On the L it appears the limiting factor is a stretch of 8 or so stations between the tunnel and Myrtle Ave without an interlocking. Adding an extra controlled point or two would mitigate the problem. |
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