I pre-booked my ticket to Westbury on Thursday, and it said that I'd get an allocated seat in Coach D when I tried to buy the ticket online, despite selecting a first class ticket. This was on the Slough-Reading sector, leaving Slough at 11:56, which is a service to Hereford. Anyone know which train is operating this route? It's a fast train (diagrammed for 14 minutes, so not a Turdo). I'd like to catch an Adelante, (first class is in coach D of an Adelante, according to Wiki) as I've not been on one.