Nostalgic and interesting photo eddyw ...Presumably thats the Scow "Echo" in the foreground ... she has just been broken up ...ie smashed to pieces on the foreshore at Picton where she has been for umpteen years rotting away. In the mid ground are the two Union SS Co tugs, if you could call them that ..... absolute shockers, more hinderance than assistance.
You are quite right Dave it is the 'ECHO', now sadly broken up in front of her the 'MARLYN', a former ML used as a small coaster between Wellington and Lyttelton in the 1950's. The Tugs 'TAPUHI & TAIOMA', and bunker barge & 'MAORI '. I would agree with your comment about the tugs.