The enterprising Railway Company re-used the underframes from three former four-wheel carriages in 1912 as an experiment while the carriage bodies went on to be mounted onto bogie underframes to become “pairs” carriages; K.13 (i) was constructed on the redundant underframes of four-wheel carriage B.12, becoming "sheep truck" K.13A in 1924 and was scrapped three years later.  K.14 (i) similarly used the frames of C.5 becoming "sheep truck" K.14A in 1924 and was scrapped in 1944.  K.15 (i) was mounted on the frames ex-B.3 and scrapped after an incident at Foxdale in 1918.