Roger Winnen & Roger Salter
History This signal with its indicator boards signalled down trains out on to the 'down main' [To Weymouth]. 'down branch', or 'to shed'.
I think the 'up branch' was used when a Weymouth train was signalled to leave at the same time as a Taunton train, and 'to shed' the loco ran down the up line to Pen Mill shed. 'Down branch' was used only when a train for Taunton was leaving as it crossed to the down main and then onto the branch. The signal was replaced at least five years ago or more. There still are semaphore signals at Pen Mill.
Many thanks for the info John.