Hill until just north of Eglinton Avenue West. There, it turned west again before returning to Union Station via the Grand Trunk Railway line (today's Barrie line) west of Caledonia Road. A complete trip around the Don Loop was approximately 27 km.

The smaller Humber Loop headed west along the northwest rail corridor of the Grand Trunk Railway through Parkdale. It turned west just north of St. Clair Avenue and then turned