Nice shot, its the Port of Calais, she sitting in one of the two ramps long gone just down from the Gare Maritime. In her car ferry role (she was multi purpose like the Railways "Vortigern" Trains, HGV, passenger and car traffic).
Travelled home for a weekend break on her (Dunkirk to Dover Train Ferry service 1974) while serving on Trinder Andersons Armadale. A pretty bland, miserable and cold ship is what I remember. Travelled back to Dunkirk in style on the lovely old Train Ferry Saint Germain, much nicer.