[1] However, in 2007, Transport Canada published new passenger vessel regulations regarding damage stability (TP10943) requiring various upgrades to be implemented within prescribed compliance schedules.

Thomas Rennie and her sistership Sam McBride, and William Inglis were also modernized under a life extension program while a fleet renewal process was undertaken.

A series of technical submissions to Transport Canada from the City's naval architectural engineering consultants took place through 2016.

These technical submissions supported Transport Canada's risk assessments that considered the ferry's operations and environmental limits.

[8] In October 2012, Toronto City Council decided that funds should be set aside to replace Thomas Rennie and her two fleet-mates with new vessels.

[11] In 1959, while a maintenance man tested its engines, the Rennie moved slowly out of its Queen's Quay dock, unpiloted.