Minggu, 14 April 2013

Re: [CanPassRail] PTC was Perceived Risk on Various Modes


Is that for the entire line, or just at the stations? I don't recall seeing any plates between the rails between stations...Is there some other means of detecting unauthorized persons on the tracks between the stations, or are they just relying on the fencing and grade separation?

It's also quite necessary for the intrusion detectors as the SkyTrain is completely automated...If it wasn't for the intrusion detectors at the stations, the train would plaster whatever was on the tracks and just keep going, to the horror of everyone in and out of the train.


On 2013-04-14, at 9:04 AM, Mark W. Walton wrote:

> That's what I had in mind. Vancouver's Sky Train and TTC's Scarborough RT
> both have track intrusion detectors that shut everything down if an
> unauthorized person is detected at track level.
> Mark Walton
> mark.walton@sympatico.ca
> -----Original Message-----
> From: Canadian-Passenger-Rail@yahoogroups.com
> [mailto:Canadian-Passenger-Rail@yahoogroups.com] On Behalf Of David Jeanes
> Sent: Saturday, April 13, 2013 8:52 PM
> To: Canadian-Passenger-Rail@yahoogroups.com
> Subject: Re: [CanPassRail] PTC was Perceived Risk on Various Modes
> --- In Canadian-Passenger-Rail@yahoogroups.com, "Mark W. Walton"
> <mark.walton@...> wrote:
>> Might PTC give advance warning of a vehicle stuck on a level crossing,
> e.g.
>> the TTC bus that stalled on the St. Clair and Laurel crossing in 1975?
>> Whether the train would still have time to stop is another matter, of
>> course.
> On 13 Apr, 2013, at 20:24, R L Kennedy wrote:
>> No. The bus did not interfere with the signals or track.
> However, when Sweden introduced the X-2000 high-speed train, they increased
> the speed allowed at level crossings to 200 km/h by placing trapped vehicle
> sensors into the road surface, by linking these sensors to the PTC system
> that Swedish Railways already had, and by installing magnetic track brakes
> on the X-2000, (subsequently also used on the German ICE trains), so that
> the trains could stop in time.
> The most serious accidents involving the TGV trains in France have also
> occurred at grade crossings where heavy road vehicles were disabled on grade
> crossings, (not on the high-speed lines).
> David Jeanes
> ------------------------------------
> For help, send an email to Canadian-Passenger-Rail-help@yahoogroups.comYahoo! Groups Links

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