If it's the Sand Pit wreck, it happened on June 8, 1912. If the photo is from the Horse Shoe Bend wreck, that happened on March 17, 1906. / Ron
PS, as information, I've attached a list of Monon train accidents, details gleaned from the records of Zeke Kauffman photos housed in the Indiana State Historical Society, many of which we also have in our archives. This is by no means a complete list of Monon accidents, only those of which Zeke had photographs in his collection.