Harland and Wolff built "Laurentic" on slipway number six of its South Yard in Belfast. She was completed on 15 April 1909 and "Megantic" followed on 3 June. "Laurentic" produced 20 percent more power than her sister for the same coal consumption. For the same power output, "Laurentic"s coal consumption was 12 to 15 percent less than "Megantic"s. This led IMM to specify a similar three-screw combination of two triple-expansion engines and one low-pressure turbine for the s that Harland and Wolff and 1911.