Didcot or is a town and civil parish in the South East region of England. It is located within the administrative county of Oxfordshire, while historically part of the traditional county of Berkshire. Didcot lies south of Oxford and is the largest town in the South Oxfordshire district. Didcot is known for its railway junction, railway museum and power stations, and is the gateway town to the Science Vale: three large science and technology centres in the surrounding villages of Milton (Milton Park), Culham (Culham Science Centre) and Harwell (Harwell Science and Innovation Campus which includes the Rutherford Appleton Laboratory).