Vestibule of a "convertible" 1st/2nd-class Corail Couchettes-car (AcBcux, VU-84), seen in the consist of Corail Lunéa 3731 "Paris-Côte Vermeille" (Paris Austerlitz--->Portbou, with through-cars to Latour-de-Carol).
Some 20 years after the introduction of these cars, those blue tones are still very relevant, and all in all, quite comparable to Lunéa standards, albeit darker.