Former Grand Trunk Western caboose 79176 rests next to the former St. Mary&#039;s Junction station along the GEXR Guelph Sub.  The Guelph Sub, originally the Brampton Sub, ended at Stratford.  West of Stratford it was the Thorndale Sub which continued to London.  From St. Mary&#039;s Junction the Forest Sub ran west to Sarnia.  The 1858 limestone depot is just out of frame at right.