I heard this on the TTC (Toronto's subway system) public address system: "506 Eglinton." What is this about? Any enlightened folks out there, who may have an answer?
Indeed, this article on Transit Toronto reveals the job code:
506 PLANT MAINTENANCE DEPARTMENT Janitors
If you're wondering about "Eglinton", it is a subway station off Yonge St.
So when you hear 506 Eglinton, they're calling for janitors and if this user is to believed on reddit:
Laxxium • Apr 12, 2011, 6:05 AM 506 is the main janitor... 504 is the secondary Janitor if there is one on duty. 502 is the Janitor's supervisor. So if you hear 506 or 504 x 2 or x3 and then a 502, someone's in trouble for not answering their call. I know this cuz I was a summer student janitor.
The 502 code appears to be updated since this comment.
I also lived in Toronto and still visit monthly. They're calling for whoever is on duty at that station.