Transfer cabooses were a common sight in 1970's Chicago, providing a platform for backup moves (in fact, some roads called them "shoving platforms") as well as carrying the conductor with all the usual waybills and other paperwork. Such cabooses were frequently cobbled together from whatever outdated rolling stock was available; in this case it appears that an old wood-sided boxcar was repurposed to create caboose no. 19111, here seen at Blue Island Crossing.
