Rick, found a photo - 1903 of a train hauling a 500 ton Blowing Engine manufactured by the William Tod Company. Supposedly this was one of only 12 of this size that the company built.
http://news.google.com/newspapers?id=qSpIAAAAIBAJ&sjid=JYEMAAAAIBAJ&pg=7162%2C6137972 (http://news.google.com/newspapers?id=qSpIAAAAIBAJ&sjid=JYEMAAAAIBAJ&pg=7162%2C6137972)