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| Re: (L) train this morning's commute DISASTER (1229892) | |||
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Re: (L) train this morning's commute DISASTER |
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Posted by j trainloco on Tue Jun 18 21:08:01 2013, in response to Re: (L) train this morning's commute DISASTER, posted by SelkirkTMO on Tue Jun 18 20:43:35 2013. Yep ... back in my day,absolute block had to be done every now and then too. We got handed up a wooden baton which we had to hand down when we got to the other side. From what I see here,when CBTC spit the bit,the railroad stopped entirely. That's certainly not a good sign. Bad service is better than no service. :)Actually, CBTC is able to establish a single track operation much quicker than a baton setup. And CBTC CAN keep trains going... it just isn't as simple as hooking down a stop arm. From what I understood when Canarsie was first going over to CBTC,I understood that they were going to leave the old signals there as a backup in case something went tits-up. I guess that wasn't the case. When it comes to critical systems design though,you don't leave yourself with only one way to win. You just don't. :( Understand that keeping the wayside and block signalling would make the point of CBTC useless. CBTC is supposed to be cheaper, while offering far more capability than a traditional fixed block system. If you have to keep the fixed block system, kind of defeats the purpose of implementing CBTC. And fixed block systems also only have one way to win. When the relay craps out, you have to disable the system; the same thing CBTC would have to endure. |
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