Shrill metro noises: the STM is on it
I tweeted the STM recently about a loud shrill noise being made by an Azur train in motion. I didn’t know the STM had already been investigating because a lot of other people had alerted them too. This item explains how the sound is generated, and why it wasn’t a problem at the launch of the new trains; the good news is that work is already being done on a fix.
In other metro news Tuesday, the CBC looks at the domino effect of small delays in the metro and shows infographics of every sort of delay. 80% of delays last less than 5 minutes and most are due to actions by passengers, not equipment failures.
Chris 08:46 on 2019-09-03 Permalink
Are we talking about the high pitch hiss that’s been there since day 1 of these new metros?
Kate 09:22 on 2019-09-03 Permalink
It’s not a hiss, it’s a high-pitched whistle, noticeable when a train starts up out of the station, or if it accelerates at any point. I noticed it for the first time last week. The article says it’s caused by a gadget added to the train doors after it was discovered that gravel tracked in on winter boots was getting into the door grooves and impeding closure. Since that fix, air gets trapped in the train and makes an unholy shriek, but they’re working on a new fix.
John B: I think that’s why I only noticed it recently. I’ve usually ridden the train up front, but only lately have had reasons to be riding in the last car instead.
John B 09:19 on 2019-09-03 Permalink
It sounds more like squealing brakes, but really loud.
The air-through-the-doors explanation explains why I only hear it at the back of the train.