ST Kerne was originally built in 1913 and named Viking but even before she was launched, she was sold to the Admiralty and re-named the Terrier and went to work in Chatham and on the Medway.
She then went in 1948 to J P Knight who operated her on the Medway for another year under her new Gaelic name Kerne before being sold on again to a firm in Liverpool where she worked as a lighterage tug until her retirement in 1971.
During 1970 and 1971 a group of steam enthusiasts bought Kerne before she went for scrap and restored her. She is now an extremely rare example of the once common estuarial-dock tug and a living reminder of early 20th century naval architecture.
For more on ST Kerne:
http://www.tugkerne.co.uk