This is a photo of the S.S. Southwark, from Ancestry Library Edition, which sailed under the Dominion Line flag:
What pushed or pulled Thomas to go to Canada? I suspect that there may have been friends or colleagues or the promise of a job, which influenced his decision to leave for Canada. The choice of Vancouver, as a final destination, required Thomas to travel by train across Canada, a journey near as long as the sea voyage that brought him to Montreal. Who or what was there waiting for him?