Rabu, 17 April 2013

[CanPassRail] Re: Grade Crossing Safety


In looking at the information in your link, they suggest that 27 seconds would be the ideal minimum time, but also acknowledge that it could be as short as 22 seconds if a train is accelerating toward the crossing. So overall, their requirements aren't that different than ours.

The training in North America is that trains aren't supposed to accelerate toward a crossing until they see that the gates have fully descended. That protects the 20 second minimum time where crossing predictor circuits are used.

If a train accelerated toward such crossings, the circuit would start when the speed and distance reached the point where 22 seconds would be required for the crossing protection circuit to operate. If the train continued to gain speed above the trigger point where the crossing protection had started, it would approach the crossing more quickly, thereby shortening the time it would take to arrive at the crossing. (If all that made any sense.)

--- In Canadian-Passenger-Rail@yahoogroups.com, "terryjohnson_canada" <terry.johnson@...> wrote:
> The UK added a steady amber caution aspect to grade crossing lights, and a requirement for emergency telephones, after the Hixton accident in 1968.
> This adds an extra five seconds to the total time between the first warning and the arrival of a train.
> Would this extra time make a difference in Canada and the US?
> The other thing that you see a lot in the UK is clear signs reminding road users: "A second train is approaching if gates stay down"
> Full details of the UK crossing regulations can be found here:
> http://www.rail-reg.gov.uk/upload/pdf/level_crossings_guidance.pdf
> Terry,
> Chatham, Ontario

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