After just returning from a short visit to the Isle of Wight, here I go again with my questions.

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Here we have a Sanderson SB55 TC, two wheel drive, rear wheel steer RTFL in use at a boat yard. But does anyone have any idea what the TC may stand for? I have seen an SB45 in the past which had no such designation so I'm thinking this larger machine may be a little different from the standard model.

Any further information on the SB55 would be greatly appreciated.

Thanks for any reply.