It’s not usually open to the public, but the once-a-year Doors Open Toronto event invites everyone to take a peek inside a collection of heritage buildings and city infrastructure. Open Doors Toronto this year was one of the last times the public will ever get a glimpse into the inner workings of the Toronto Transit Commission’s Line 3 Scarborough Rapid Transit.

It is going to cease service in November 2023 as it will (finally) be replaced by a proper subway extension. Reluctantly built in 1985 as a testing site for an intermediate metro, it replaced the originally-planned tram line, which Toronto is accustomed to. The system only had a service live until 2015, which was extended until the subway extension would replace the service.

The stretched service life of the trains and stations meant they were notorious for being in a state of disrepair. Passengers would often find leaky fixtures, structural damage from corrosion, holes in the floor large enough to see through to the track, and reduced service from increased vehicle maintenance downtime.