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So people walk out after a 10 minute outage, then it’s fixed, but you can’t turn power on because a few people have decided to go for a stroll?

taway_6PplYu5 3y ago
yes, because what if one of those people is touching the power rail? What do we know about the demographics of the people walking? How do we know they all made it out, or is someone lying down somewhere on the track?
- mnd999 3y ago
  There's no power rail. It's overhead power - that was the problem. According to the union a manager providing strike cover was responsible for damaging the overhead lines - https://www.standard.co.uk/news/transport/gwr-train-cables-paddington-elizabeth-line-strike-aslef-b1125750.html https://www.standard.co.uk/news/transport/gwr-train-cables-p...
  - midasuni 3y ago
    That seems slanderous by the Union. They are suggesting that (likely a senior instructor) caused the collision and one of their members would have avoided it.
lotsofpulp 3y ago
Hence the different protocols needed for a 10 minute outage and a 3 hour outage.
- vkou 3y ago
  You can't tell at the 10 minute mark whether or not power will be back in 10 more minutes, or in 3 hours.
  - jameshart 3y ago
    In software incident management the rule of thumb is that at the n minute mark, in general, expected outage duration is 2n minutes.
  - ryanjshaw 3y ago
    But you can tell when 3 hours have passed and decide upfront - as a matter of policy - where to draw a line.
    - vkou 3y ago
      And at the 4 hour mark, the passengers were rescued. It would be ironic, of course, if the rescue train hit any one of the geniuses that smashed windows and started walking the tracks.
    - midasuni 3y ago
      And where would you draw the line?
  - switch007 3y ago
    Once you detect that electricity supply is damaged and that it’s over 10 miles and you know how many trains have stopped moving … you know it won’t be 10 minutes. It can’t take long to figure out what trains have stopped moving and where electricity has been cut.

taway_6PplYu5 3y ago

yes, because what if one of those people is touching the power rail? What do we know about the demographics of the people walking? How do we know they all made it out, or is someone lying down somewhere on the track?

mnd999 3y ago
There's no power rail. It's overhead power - that was the problem. According to the union a manager providing strike cover was responsible for damaging the overhead lines - https://www.standard.co.uk/news/transport/gwr-train-cables-paddington-elizabeth-line-strike-aslef-b1125750.html https://www.standard.co.uk/news/transport/gwr-train-cables-p...
- midasuni 3y ago
  That seems slanderous by the Union. They are suggesting that (likely a senior instructor) caused the collision and one of their members would have avoided it.

lotsofpulp 3y ago

Hence the different protocols needed for a 10 minute outage and a 3 hour outage.

vkou 3y ago
You can't tell at the 10 minute mark whether or not power will be back in 10 more minutes, or in 3 hours.
- jameshart 3y ago
  In software incident management the rule of thumb is that at the n minute mark, in general, expected outage duration is 2n minutes.
- ryanjshaw 3y ago
  But you can tell when 3 hours have passed and decide upfront - as a matter of policy - where to draw a line.
  - vkou 3y ago
    And at the 4 hour mark, the passengers were rescued. It would be ironic, of course, if the rescue train hit any one of the geniuses that smashed windows and started walking the tracks.
  - midasuni 3y ago
    And where would you draw the line?
- switch007 3y ago
  Once you detect that electricity supply is damaged and that it’s over 10 miles and you know how many trains have stopped moving … you know it won’t be 10 minutes. It can’t take long to figure out what trains have stopped moving and where electricity has been cut.