Out of interest; on this route where does Up change to Down as I assume it must at some point as trains actually pull into Exeter St Davids in the Up direction on the GW▸ line.
Presumably a through train from Barnstaple to Exmouth runs as a Down service as far as St Davids and then an Up before possibly becoming a Down again once it branches off after St James Park station?
A through train from barnstaple to exmouth runs as an up service as far as St Davids, then changes to a down service to exmouth, even though it will cover some of the journey on the up waterloo. Though it could start from St Davids on the down waterloo (platform 3) and change back to the up waterloo at the crossover between Exeter Central and SJP, though remain a down service. Simple isn't it?!
