SOO X5001 is actually a former Milwaukee Road drovers car and was one of a group of 15 original cars. These steel cupola cabooses were built by the Milwaukee in 1929 and were their first steel cabooses. The X5001 was originally built as the MILW 01612 but later became an instruction car, then a superintendent's office and was renumbered MILW X5001 somewhere along the way. When the Soo Line assumed control of the Milwaukee Road in 1986 the car retained the X5001 number. This may be one of the only cars in the group to ride on express reefer style trucks.This caboose is part of the collection at the Illinois Railway Museum in Union, Illinois. Image taken June 11, 2006