This Mexican airmail stamp, issued in 1950, commemorates the inauguration of the Ferrocarril del Sureste (Southeast Railway). Printed in blue, it depicts the portrait of President Miguel Alemán (1946–1952) alongside a detailed illustration of a railway bridge, symbolizing modern infrastructure and progress. The 35 centavos denomination was intended for airmail use, reflecting Mexico’s emphasis on rapid communication and national development during this period. Produced by the Talleres de Impresión de Estampillas y Valores, it stands as a key piece for collectors of transportation, presidential, and Mexican airmail issues.