Tom has completed the first part of his night fighter training and there has been a delay before the second part trainers have space to take them, so he and his training squadron were given 8 days of leave, plus travel to and from Chicago. His telegram notifies his dad that he’s coming, the time and date of his arrival, and the name of the train, “The Southern Pacific Challenger.”  Dr. Cartmell has written on the telegram, “Northwestern, Madison and Canal” indicating the name of the arriving train station (Northwestern Station) and the address (corner of Madison and Canal Streets in Chicago).