If you ever want more info about a transit delay than what you get from official communications, or if you want a better sense of daily issues on trains and buses (most of which are never reported to the police/press), check out this unofficial feed: https://www.broadcastify.com/listen/feed/31629
Here’s a 1-minute video showing the Transit Control centre where many of these calls are received: https://www.youtube.com/watch?v=KQoKVmNJlSs
I used last time I was on subway and the trains stopped, a man jumped on the rails and went into the tunnel, the where searching for him for 10-20 minutes!