The Heathrow Express service runs every 15 minutes throughout the day and evening, seven days a week. It runs non-stop between Paddington and the airport. (The Heathrow Connect used the same route but made some stops in between.) At the airport, trains from Paddington stop at two stations, both of which are located underground: Heathrow Central (for terminals 2 and 3) and Heathrow Terminal 5. There is also a shuttle train that goes between Heathrow Central and a station at Terminal 4, which is also underground. The 12 trains used on services between Paddington and Heathrow are Class 387, while the shuttle service to Terminal 4 used one Class 360.