From Classic Trains: “Before the current Chicago Union Station was opened in 1925, trains of the PRR, CB&Q, and Milwaukee Road used a terminal, Monroe Street Union Station, at roughly the same riverfront location. In this 1919 view, CB&Q Lounging Car No. 201 is on the rear of a Burlington train ready to depart south while Milwaukee 4-6-2 No. 6512 pants at the head of a northbound train.” C. Jones Jr. coll.