https://cptdb.ca/wiki/index.php/Toronto_Transit_Commission_4400-4603 is probably the best resource.Is there a tracker on how many are delivered, how many returned for repair/rework, how many in service and the number outstanding?
4519 did a test run to Broadview sometime after I posted and currently in the service bay, to the point may not enter service on Sat now.
4521 out testing and 20 in the service bay.
If someone posts a shot of 4572's nameplate showing Made in Kingston (Millhaven?) I promise I'll click Like...