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Here's a few ideas (some a bit more tongue in cheek than others):
Bournemouth - Chester/Liverpool (calling at Christchurch, Brockenhurst, Southampton Central, Romsey, Salisbury, Warminster, Westbury, Trowbridge, Bath Spa, Keynsham, Filton Abbey Wood, Bristol Parkway, Yate, Gloucester, Cheltenham Spa, Worcester Shrub Hill, Worcester Foregate Street, Great Malvern, Ledbury, Hereford, Leominster, Ludlow, Shrewsbury, Wrexham General and Chester. Peak time trains would run via Halton Curve and stop at Runcorn, Liverpool South Parkway and Liverpool Lime Street)
Birmingham Moor Street/Birmingham Snow Hill to Weymouth (calling at Solihull, Dorridge, Warwick, Leamington Spa, Banbury, Oxford, Swindon, Chippenham, Melksham, Trowbridge, Westbury, Frome, Yeovil Pen Mill, Dorchester West and Weymouth. - Trains would stop at Maiden Newton for the exchanging of tokens only)
Brighton to Plymouth & Swansea (calling at Hove, Shoreham-by-Sea, Worthing, Barnham, Chichester, Havant, Southampton Central, Romsey and Salisbury where the train divides. Front three coaches for Tisbury, Gillingham, Templecombe, Sherborne, Yeovil Junction, Crewkerne, Axminster, Honiton, Exeter Central, Exeter St David's, Dawlish, Teignmouth, Newton Abbot, Totnes, Ivybridge and Plymouth. Rear three coaches for Warminster, Westbury, Trowbridge, Bradford-On-Avon, Bath Spa, Oldfield Park, Keynsham, Bristol Temple Meads, Filton Abbey Wood, Patchway, Severn Tunnel Junction, Newport, Cardiff Central, Bridgend, Pyle, Port Talbot Parkway, Neath and Swansea.)