The Grand Trunk Pacific Railway was a historic Canadian transcontinental railway running from Fort William, Ontario to Prince Rupert, British Columbia, a Pacific coast port. East of Winnipeg the line continued as the National Transcontinental Railway (NTR), running across northern Ontario and Quebec, crossing the St. Lawrence River at Quebec City and ending at Moncton, New Brunswick. The Grand Trunk Railway (GTR) managed and operated the entire line.

Thunder Bay is a city in and the seat of Thunder Bay District, Ontario, Canada. It is the most populous municipality in Northwestern Ontario and the second most populous municipality in Northern Ontario; its population is 108,843 according to the 2021 Canadian Census. Located on Lake Superior, the census metropolitan area of Thunder Bay has a population of 123,258 and consists of the city of Thunder Bay, the municipalities of Oliver Paipoonge and Neebing, the townships of Shuniah, Conmee, O'Connor, and Gillies, and the Fort William First Nation.