Hi Simon,

That grey colour looks very much like the colour used on "The Old Grey Funnel Line" (The Royal Navy).

Thousands of surface warships were painted in a 'battleship grey' colour both inside and out and with a black boot-topping.

Submersible warships were mostly black on the outside but probably grey inside.

It makes sense to order millions of gallons of one colour than have different types of ships painted in different colours.

I could well imagine that the silver colour was added recently, perhaps to enhance things for visitors in an often, not to brilliantly lit interior.

Regards
MPC

PS If you look closely at the paint job you can see that it is not particularly well done as the painter has not bothered to clean it off the brasswork.

PPS Yes I would say that grey is, perhaps, the original colour but was it the colour used by the Germans or the Norwegians??