Grand Trunk Railway St. Mary's Junction
The Grand Trunk Railway was incorporated in 1853 to run from Sarnia to Portland, Maine. Although it took in existing lines, new ones had to be built, including the Toronto to Sarnia section which was undertaken by the Canadian firm of Gzowski and Company and completed in 1859. This station is a rare example in stone of the stations built by the Gzowski firm for the Grand Trunk. Erected in 1858, the station served for a time as the western terminus of the line and later became an important junction on the railway.
Plaque via Alan L. Brown's site Ontario Plaques. Full page here.