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Post by Deleted on Feb 3, 2007 20:14:16 GMT
According to a railway magazine, TPWS is installed at almost all locations, but will not ever be used, due to huge costs involved.
Are we now taking a retrospective step in railway safety? Why spend thousands installing thr arming loops between the rails and 10 yards in advance of signals when it's not even going to be used?
No doubt, us the rail user will end up footing the bill for it's removal...
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Post by Deleted on Feb 3, 2007 22:06:59 GMT
It's not being removed at signals, and it is in use wherever it's installed and commissioned.
It is the TPWS loops at PSRs (Permanent Speed Restrictions) that are being removed.
Sam
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Post by ongarparknride on Feb 4, 2007 5:05:44 GMT
Hi Guys, It sounds like you are discussing the "Morpeth Rules" resulting from the 1969 crash.
aka: Dilemma over providing driver warnings of excess speed; leaving it to driver or forcibly applying brakes by train protection system; drivers can get overloaded with repetitive warnings to the point of "shutting them out"; and - bluntly - it's cheaper to pay victims compensation that spend the money making the system safer.
Masses of precedents and discussions - fortunately IMHO the age of the LU has a bit of a benefit in that if it works, don't try to fix it! Also, the arguments are largely irrelevant to LU as a local commuter system -v- high speed inter-city type operations.
The national railways lost out because only the GWR developed a viable system, and the money ran out to introduce the rest of the former private lines to a national standard system after grouping and WW2 that was anywhere near as good as the GWR.
Does that sum it up, folks? If so, it looks like the main discussion is about this country having lots of hills and tight curves, hence zillions of potential warnings, hence driver fatigue like the poor guys have most hours of their shifts doing Bournemouth-Waterloo (or wherever!) on single and double yellows.
I think our train drivers are wuunnnddderfullll - the concentration and distractions, let alone not much gets done when SPADs repetitively occur at notorious signals, year after year.
What price safety, but equally humans make mistakes.
Anyhow, not wishing to risk getting a Yellow Card for a "rant" on a *non* LU thread :-)
cheers,
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Post by Deleted on Feb 4, 2007 11:21:56 GMT
Some of the GWML (not sure how much) is fitted with a system called ATP, which completely prevents spads as it will stop a train before a red signal if it is going too quickly, whereas TPWS, which is only effective up to 70mph, will only stop a train within the signal's overlap.
The PSR overspeed loops are often inaccurately set and drivers are caught out, as they are not told the real speeds that they'll get stopped at...
Sam
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Post by Deleted on Feb 4, 2007 17:09:44 GMT
The GWML is fitted with ATP in the following areas:
Paddington pfms 1-14 (only ones I've ever seen HSTs in) Paddington approaches (Lines 1-6) GWML Main Lines from Ladbroke Grove (end of approaches) to Bristol Temple Meads via Bath GWML Relief Lines from Ladbroke Grove (end of approaches) to Airport Junction
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