The closest and main train station is Plymouth Railway Station. Ivybridge is another option, which is easy to reach from the A38, but as a local train station, not all trains stop there.
Plymouth Railway Station offers regular services to London Paddington, Bristol, Birmingham and as far as Edinburgh. Bus route 2/2A provides a regular service between Sherford and the station. For those that wish to drive or cycle, there are parking spaces at the station.
More information about the facilities at Plymouth Railway Station can be found at gwr.com