In the late 1930s, France's regional railways had merged to form a single nationwide, nationalized company, known in French as Societe National de Chemins de Fer (SNCF) and in English posters and literature as French National Railway or Railroads. Abel, who created at least two posters for SNCF circa 1950, including this one in 1947, gives us an aerial view of Chenonceau.
The castle was taken over by the King Henri II soon after it was completed in the 1500s and became a pawn in the struggle between his wife and mistress. The king installed his mistress Diane of Poitiers (twenty years his senior) in Chenonceau, but his jealous wife, Catherine de Medici, evicted her and took over after Henri's death.
Diane had the extension that bridges the river built in the mid-16th century, Catherine decorated it and added topiary gardens. She passed the castle on to her daughter-in-law, the consort of Henri III. Ownership passed hands many times since then, culminating in an early 20th century sale to the current owners, the Menier family of chocolate fame.