Inscription on back: “In 1917, the Pullman Company rebuilt three sleeping cars as traveling laboratories for the American Red Cross. They were used to control epidemics and were named for doctors who made important contributions in the field of communicable diseases: Reed, Metchinkoff, Pasteur. The 1913 model, also a rebuilt Pullman, was operated by the ‘Asociation Mexicana de la Cruz Roja’– the Mexican Red Cross.”