I'm not sure that adding extra tracks between Queen Street and Central (and presumably bunging an extra platform or so in at Central) would be all that simple and it might be a bit more disruptive than the current plans.
Queen Street only has one bay platform.
There is actually a second bay platform at Cardiff Queen Street, which is not in use at the southern end of platform 5. There is also a lot of free land for adding extra tracks south of Cardiff Queen Street if required.
Having looked at the diagram in the white paper and Google Maps, it appears the idea is to run tracks under the A4232 and onto street level on or alongside Roath Dock Road and then run on street along Pierhead St and either around the back of the Millenium Centre (or past the Senydd and then in front of the MC) and up towards the exiting Cardiff Bay Station.
Given that there is unlikely to ever be a spur on the city line towards Creigau (housing in the way), it would make more sense to have a Cardiff Queen Street to Cardiff Parkway service, which would be cheaper and easier to achieve.
They can worry about Callaghan Square in the future, if there is the demand.
After all, everyone heading to Cardiff Bay from Pontypridd, etc is going to take a direct train shortly and anyone coming in from Barry, Penarth, Caerphilly, etc, would change at Queen Street, so anyone heading to the bay from along the South Wales mainline can simply go via Queen Street.
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