At the moment, Yeovil is capable of holding 12 carriages, 6 in Down Siding #1 and 6 in Down Siding #2 . So 4 159 units essentially.
Currently, Drivers sign Waterloo to Exeter via Salisbury, Salisbury to Bristol and Westbury to Yeovil via Castle Cary.
That being said, from December 2021, SWR...