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View Diary: 60 Reported missing in Lac-Megantic oil train explosion (42 comments)

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  •  if they are still airbrakes (4+ / 0-)

    like the old days, the brakes should all have locked once the train was de-coupled from the locomotive's air pressure source.  iirc,  that's how they work.

    don't always believe what you think

    by claude on Sat Jul 06, 2013 at 02:44:19 PM PDT

    [ Parent ]

    •  The brakes on filled rail tanks rolling at speed (3+ / 0-)
      Recommended by:
      Lefty Coaster, LieparDestin, Creosote

      do not stop the rail tanks quickly .
      If , as reported , the rail tanks were going very quickly down an incline , it might be that it would take a good long while to slow down / stop .
      In a working train , part of what the human running it does is control the speed such that the brakes are not overtaxed .
      In a run away train there is no such thing , it can get going at speeds that no rational human would allow , it can get going such that the brakes are not going to be effective at controlling / keeping from going up in a overheated puff of smoke .

      The report is now the locomotive was also found down the hill from where it was parked , if the whole train started down the slope , gaining speed until it came from togetherness , the rail tanks might have been going real good when the airbrakes came into play , perhaps the speed and incline was more than what the brakes could absorb before over heating ? If the brakes overheated and started to fail the rail tanks might not have been slowed enough , the failure / overheat might have gotten into a runaway zone that caused greater heating and more failure .

      Anyway , I'm sure it will all be written up soon ,
      then I'll read the reports of how it all happened .


      The standard you walk past is the standard you accept. David Morrison

      by indycam on Sat Jul 06, 2013 at 03:11:57 PM PDT

      [ Parent ]

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