(1953, Jacques Tati)

“A modern-looking underfloor-engined dual entrance coach, with roof luggage rack, features in a scene which culminates in a child getting its head stuck in the steering wheel!” (a Renault R4192, circa 1950) “A 'hotel bus', seemingly a French pre-war 20-seat normal control vehicle, also with roof luggage rack, appears several times in this classic French comedy.” (a Citroën type 23U)
(thanks Bill Mellor)