Thomas was the largest vessel to travel on the Peace River, during its riverboat era.
[1] Her first owner was the Peace River Development Company, operated by her namesake, Welsh industrialist D. A. Thomas.
Thomas made an attempt to travel up the initial portion of the Peace River Canyon, so she could load coal more directly from the coalfields at Hudson's Hope.
By 1929 a railway had been built to Fort St. John, British Columbia, on the upper river, making water transportation less important.
[1] In response the Hudson's Bay Company decided to try to shift her to a different section of the river, by running the Vermillion Chutes.