The CPR double - tracked its Winnipeg -- Thunder Bay line .
In the era of Sir Wilfried 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 Thunder Bay 's Winnipeg -- Thunder Bay line .
In the era of Sir Wilfried 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 .