Severn Tunnel Junction or north Bristol stations might be more useful than Chepstow.
In terms of getting to Poole?
Yep. Chepstow is on the Gloucester - Cardiff line and not much use for heading south. You might be able to get direct trains from Bristol Parkway to Dorchester, or Parkway > Southampton > Poole.
@hippy started
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Severn Tunnel Junction or north Bristol stations might be more useful than Chepstow.