Merlin was the second of another four ship order for Diesel-engined tugs from the Manchester Ship Canal Company Ltd.
She was 131 gross tons and powered by a single screw Crossley Diesel engine producing 770 h.p.
She had an overall length of 86 feet and a beam of 23 feet, and a draught of 12 feet.
She was launched on 27th February 1940.
They were superior it was said at the time to the steam powered tugs previously built for the company.
M.S.C. Merlin (Ship No 295)