Edinburgh Waverley railway station, often simply referred to as Waverley, or as Edinburgh, is the main railway station in the Scottish capital Edinburgh. Covering an area of over 25 acres (10 ha) in the centre of the city, it is the second-largest main line railway station in the United Kingdom in terms of area, the largest being London Waterloo; and is both a terminal station and a through station, in contrast to the majority of central London stations. Ticketing generally regards Waverley and Haymarket as interchangeable subject to operator validity.