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A computer upgrade shut down BART

(www.bart.gov)
232 points ksajadi | 1 comments | 05 Sep 25 14:52 UTC | HN request time: 0.2s | source
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phkahler ◴[05 Sep 25 15:32 UTC] No.45139746[source]▶
It'd be pretty cool if busses and trains were local-first.
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gjsman-1000 ◴[05 Sep 25 15:34 UTC] No.45139769[source]▶
If you can't send updated schedules or emergency alerts through the system, I also don't want service started. It doesn't have to be an individualized problem to render local-first useless.

Also, what do you mean by trains being local-first? Trains by definition need to share the same tracks with catastrophic consequences for getting it wrong. You can't figure out if a train is going to possibly be on the same route locally, or if your route has been obstructed. Somebody gets a schoolbus stuck on a crossing, it takes over a mile to stop a train.

replies(5): >>45139826 #>>45140427 #>>45140633 #>>45140774 #>>45144247 #
1. Aachen ◴[05 Sep 25 16:44 UTC] No.45140633[source]▶
I don't think it needs to be taken that literal. The train orchestrator can set signals on connected tracks and read out the block statuses without needing to also be able to reach HN and the wider internet. Local can be the track you're on, not merely driving on sight (but, yes, worst case you'd hope there's still procedures for that, too)