Sabtu, 13 April 2013

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


--- In, "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

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