Northwestern Steel's steam engines were among the last to operate in the United States. Old No. 73, as it was known, (a 1929 Baldwin locomotive) was among the final steam engines to be used in regular service in America. NWSW last used the locomotive on Dec. 3, 1980 at 10 a.m. Its final run was made coupled to the technology that replaced it, a diesel engine. On Jan. 19, 1981, No. 73 was moved to the south lawn of the Paul W. Dillon Home. From tracks inside the steel mill complex, the locomotive was taken east along the Geneva Subdivision main line of the Chicago & North Western Railroad a mile and a half to a location which passes just behind the Dillon home. 73 was then lifted via four cranes and moved the last 75 yards to its final resting place as a memorial to Dillon, the man who kept the idea of steam engines alive for more than twenty years.