 By the 1930s the line was worked by L and L1 class 4 @-@ 4 @-@ 0 locomotives . The Schools class 4 @-@ 4 @-@ 0s were introduced in 1930 ; the width of these was 8 feet 4 inches ( 2 @.@ 54 m ) measured across the cab , and 8 feet 6 1 ⁄ 2 inches ( 2 @.@ 604 m ) measured across the cylinders . The service was again reduced during World War II , with fourteen trains daily in 1942 , of which four were fast ; there were seven trains on Sundays . As built , it was envisaged that the West Country and Battle of Britain class locomotives would be able to work the line . Forty @-@ eight locomotives of the West Country and 22 of the Battle of Britain class were built with cabs that were 8 feet 6 inches ( 2 @.@ 59 m ) wide and paired with tenders of the same width . It was subsequently decided not to work these locomotives over the line . Locomotives from these two classes that were rebuilt gained a 9 @-@ foot @-@ 0 @-@ inch @-@ wide ( 2 @.@ 74 m ) cab . Unrebuilt locomotives retained their narrow cab . 
