Also do these help. Robust from build was delivered to the RMAS and was stationed for a while at Gibraltar before ending up at Devonport and mostly used as a harbour tug. The other two were delivered to the Ocean tug group which was a sub group of the RFA and were mainly at Singapore and were black hulls and light grey upper-works, with two lifeboats and that huge square fender on the bow which wiped out a few stanchions and was removed under RMAS ownership as was the lifeboats. Their stability was not brilliant and would roll heavily in a flat sea and not many men could hold their dinners down at sea. Had a bollard pull of 50tons but after 15 minutes the power had to be reduced to over heating of the engines. In RMAS, they were painted black hull, white line along the bottom of the bulwarks. Superstructure buff, all deck machinery was painted black, handrails and portholes on superstructure white, boat davits when carried white, masts buff, standing wire rigging to masts white. The equipment on the flying bridge such as the signal lantern was covered in grey canvas covers. The towing Horses (some call bows in the civilian world)were painted black, the fitting of the 100 ton lift blocks tackle on the starboard side were never fitted but carried below in the salvage store. They had a third engine control unit fitted on the aft end of the superstructure with the wheel control by orders over the P/A system. Originally they were to be copies on a smaller scale of the Englishman, I did see the original outline drawing and they would have been handsome craft. But the senior master said he would not have engineers on the same deck as as deck officers and the engineers said they would not live on the same deck as the crew, so the original bridge deck became the deck officers accommodation, and a funny chicken hutch was placed above as a bridge. Next salvage officers wanted extra machinery for divers and a diving team that extended the back of the accommodation block plus the fire fighting monitors platform above the accommodation and lastly they cut 30 foot of the front end with out compensating for stability so that they could be used in harbour. That is why they rolled and pitched heavy and made me and many others very sea sick. Hope that gives you some idea about them but if you have any queries do not hesitate to ask as i am sure that I can get more info on them if required.