DURING the 1930s, Calshot manoeuvred the world's greatest ocean liners - Queen Mary, Queen Elizabeth, United States, France - as well as countless other vessels in Southampton Docks.
She was certified to carry 566 passengers and even had first and second class saloons.
During the Second World War, Queen Mary and Queen Elizabeth carried some 1,500,000 servicemen.
Queen Mary crossed the Atlantic 86 times, while Calshot went north to the Clyde and ferried troops to and from both liners. She returned to Red Funnel after the war, before being sold to a subsidiary of Holland American Line and renamed Galway Bay and used as a ferry.
The city council brought the tug back to Southampton in 1986.
City-based TV producer Terry Yarwood set up the Tug Tender Calshot Trust in 1997 after coming across the vessel in a sad state of disrepair while he was making a promotional film for ABP.
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