What would the practicalities of running services from Swindon to Cheltenham then Gloucester instead of reversing at Gloucester be? I know that means blocking what seems to be – as far as I can tell – one of two lines at Cheltenham for the reversal, which probably makes it more complicated than it's worth. How much time would it save between Swindon / Paddington and Cheltenham, and how much time would it add on for Gloucester? Could two trains per hour be run west of Swindon, with one going to Gloucester first and one via Cheltenham (similarly to how Snow Hill line services used to – I don't know if they currently do – serve Worcester Foregate Street, Shrub Hill, or both)?