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Article #624780Re: OT: RR positive train control
From: hanc...
Date: Sat, 07 Jul 2018 19:11
Date: Sat, 07 Jul 2018 19:11
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2703 bytes
On Friday, July 6, 2018 at 6:07:47 PM UTC-4, John Levine wrote: > In article <483113ac-e620-4be1...@googlegroups.com>, > <hanc...@bbs.cpcn.com> wrote: > >OFF TOPIC > > Well, sort of. > > >There is a big push now to implement Positive Train Control on > >passenger railroads. > > > >Anyone familiar with it? > > >However, it seems than an earlier system did everything the new > >expensive high tech system does: > >https://books.google.com/books?id=0SADAAAAMBAJ&lpg=PA2&dq=popular%20science%20july%201951&pg=PA50#v=onepage&q&f=false > > The 1950 system enforced speed limits. PTC does a lot more than that, > like stopping a train if it enters a block with another train in it. > > PTC is relatively difficult in the US because we have long stretches > of unsignalled track, but the main problem is that the railroads don't > want to spend the money. See the Wikipedia article for more info on > what it does and the ways it can work. The July Trains magazine article described PTC. It required a great deal of hardware and infrastructure, yet it wasn't clear what PTC did that ATC didn't already do, or could be easily made to do. For instance, a train could be easily stopped before entering an occupied block by giving a speed code of zero and setting that to stop.
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