TSS T/T Calshot

The steam ship TSS T/T Calshot is a tug tender built in 1929 by John I Thornycroft & Co, and completed in 1930 for the Red Funnel Line. Upon the tugboat's completion, she was put into service tendering the various liners that stopped either in the Solent or Southampton Water which saved them the time and expense of docking just to take up or set down a few passengers. She was also used to augment the excursion fleet. Calshot remained in service with Red Funnel from 1930-1964.
en.wikipedia.org/wiki/TSS_T/T_Calshot