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| Re: The Return Of ''Rapid'' Transit ? (1499954) | |||
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Re: The Return Of ''Rapid'' Transit ? |
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Posted by Michael549 on Mon Jan 14 12:41:03 2019, in response to Re: The Return Of ''Rapid'' Transit ?, posted by MainR3664 on Mon Jan 14 06:53:38 2019. From a previous message:"I guess what I'm saying is that those of us here can see that an investment of billions in CBTC isn't really what's needed; they can make significant improvements with proper use, placement, and maintenance of the existing signal system." Help me out here - as I understand it: The current signal system is a kind of analog computer with track detection elements serving as a kind of input sensors, the home signals and stands as a kind of output, and switch machines and related diagram board serving as a kind a "command control center" aka keyboard & output screen. This analog system as several (or many) features built into it - opposing tracks can not be switched onto the same track, trains can be kept at certain distances, switches can not move while a train is moving over the switch, etc. The basic problems are: a) Analog computers are not made anymore - the world has long since moved on to digital computers b) Many of the components - mechanical electrical relays and related equipment are not longer being made, spare parts have to be cobbled together - which is not sustainable over the long period c) Newer desired features are not that easily to implement - such as automated train control, identification, etc. d) Problems with the current system are not that easy to fix -- Or at least that is what I understood as the reason to go towad CBTC. Mike |
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