Slight change in topic ...
An alternative is do you, as train planners, say "Bristol already has a service to Weymouth" and look at running the HST▸ from, say, Cardiff via Bristol Parkway to Swindon and then as per the last few weeks. Gives a new journey opportunity for some and for those using Bath or Bristol Temple Meads the option of changing at Swindon or Bristol PW▸ on either the outward or inward leg.
St Philip's Marsh,Lawrence Hill, Stapleton Road, Filton Abbey Wood, Bristol Parkway, Swindon, Chippenham, Melksham, Trowbridge, Westbury, Castle Cary, Yeovil, Thornford, Maiden Newton, Dorchester West, Upwey, Weymouth.
Don't quite want to have that out in public (and there are one or two elements in jest in there!)