I remember up until the early 2000s you could travel from Plymouth to Waterloo, Portsmouth and even Brighton without having to change trains. The last TOC to do this was South West trains. Now they don't go any further west than Exeter Why did they stop this service? I certainly think there would be demand for Waterloo services from Plymouth as the FGW Plymouth to Paddington service is very popular and in high demand in the morning. It would give people more choice, and Waterloo is a closer commute to the City and Docklands. It would also allow people in Plymouth to reach East Devon, Dorset and Hampshire without changing.