St. Clair Tunnel Opening

On June 6, 1891, the St. Clair Tunnel opened beneath the St. Clair River, representing a major engineering triumph for the Grand Trunk Railway. Designed by Joseph Hobson, the 1,863-meter bore used innovative shield tunneling methods and electric lighting, allowing steam locomotives to pass safely between Canada and the United States. The project overcame flooding risks and soft clay geology. It facilitated massive grain and passenger traffic growth, symbolizing cross-border cooperation and remaining in service until 1995 when a larger replacement tunnel was built.