In the era of Sir Wilfrid Laurier, Thunder Bay began a period of extraordinary growth, based on improved access to markets via the transcontinental railway and development of the western wheat boom. The CPR double-tracked its Winnipeg–Thunder Bay line. The Canadian Northern Railway established facilities at Port Arthur. The Grand Trunk Pacific Railway began construction of its facilities at the Fort William Mission in 1905, and the federal government began construction of the National Transcontinental Railway. Grain elevator construction boomed as the volume of grain shipped to Europe increased. Both cities incurred debt to grant bonuses to manufacturing industries.