The eastbound Port Huron entrance to the CN International Rail Tunnel on the main line to Sarnia and beyond.  You can see the old tunnel entrance to the right of the new tunnel.  [Charlie Whipp photo].  Below, another photo of the portal on the American side of the tunnel.  The new tunnel is at the left, and the old tunnel is at the right.  [Chip Walker]

Below, a postcard view of a pair of St.Clair Tunnel Company electric locomotives at Port Huron.  [Charlie Whipp Collection]