What was a Rowsley 9F doing at Weymouth?

Peter Kerslake says "A possible explanation for 92008's appearance could be that following successful trials with 92004 over the Somerset and Dorset line in March 1960 four other early members of the class were drafted to Bath Green Park to assist with the 1962 Summer workings between Bath and Bournmouth, followed by various other members of the class which also made appearances on the Somerset and Dorset especially during 1962 , although these later arrivals were not formally transferred to Bath, so this could well be such an instance."