The laker is powered by a single 6-cylinder 9,600 b.h.p. (7,061 kW) Sulzer model 6RND76 diesel engine built in 1969 by Sulzer Bros. Ltd., Winterthur, Switzerland. Burning intermediate grade 180 fuel, power is fed to a single fixed pitch propeller giving the vessel a rated service speed of 17 mph. She is equipped with a controllable pitch bow thruster. As originally built with the 75' 00" (22.86m) beam, the vessel could carry 29,700 tons (30,177 mt) at a mid-summer draft of 29' 06" (8.99m) in 5 holds serviced by 23 hatches. The holds had the cubic capacity to carry 28,800 net tons (equivalent to 25,714 tons or 26,127 mt) of coal. Her original self unloading system included hopper styled holds gravity feeding through hydraulically operated gates to 3 tunnel belts to a single stern transfer belt onto a loop belt elevator system to a stern mounted 249' 06" (76.05m) discharge boom that could unload the vessel at a rate of 5,413 tons (5,500 mt) of iron ore or 3,937 tons (4,000 mt) of coal per hour.
The Tadoussac departed Collingwood, ON on her maiden voyage October 2, 1969 light for Fort William (now Thunder Bay), ON to load iron ore. In 1972, she was the first downbound vessel through the Welland Canal opening the Port of Hamilton, ON for the season on April 4, 1972. She then turned around and the next day became the first vessel to be upbound through the