1st-class compartment of a "convertible" 1st/2nd-class Corail Couchettes car (AcBcux, VU-84), diagrammed on Corail Nuit 5507/6 (Ventimiglia-->Portbou).
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Whenever a compartment is used as 1st-class accommodation, the middle couchettes are locked upwards, which leaves 4 couchettes. Unfortunately, there is no way whatsoever to apportion this extra room among both levels, as the top couchettes may not be lowered. 
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These dual-class couchettes are comfortable, but they remain somehow substandard to those of Ac9ux cars, viz. harder and narrower (10 compartments per car, instead of 9).
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In spite of this, AcBcux are mostly used as 2nd-class cars, and when they feature 1st-class accommodation, they primarily replace antiquated UIC cars (Ac4Bc5x)...
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As this service was merely branded "Corail Nuit" (and not "Corail Lunéa"), passengers had to prepare their couchette themselves, using bag beds and an outdated Scottish blanket...
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Ventimiglia.
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24th July 2005.
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P.L.Guillemin (plguillemin@yahoo.fr)