Hello Thomson and welcome to the railway Forum. I don't know the 00 gauge Caledonian coaches, but most Hornby coaches can be opened up by using a fine bladed screwdriver between the side of the body and the chasse. There are normally 4 lugs, one on each corner. Do them one at a time, but insert a bit of thin plastic as each one is opened to stop them re-locking as you move on to the next lug.
Hope this helps.
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The Old Git, Syd
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