Westminster Station is a busy Muggle transport hub located in central London. Described in the books as having a white-tiled interior, it is part of the extensive London Underground network. Access from the street level is via a flight of dirty stone steps, leading down into the bustling station. As a place of advanced Muggle technology, it proved to be a source of great fascination for wizards unfamiliar with non-magical life. Arthur Weasley, for instance, was completely baffled by the automatic ticket machines and the electronic turnstiles, which he referred to as “barriers with slits in them.” His attempts to navigate these barriers required the assistance of both Harry Potter and a Muggle station guard. The station serves as a key travel point for those on the District Line of the Underground.
Westminster Station plays a significant role in Harry Potter and the Order of the Phoenix as the means by which Harry Potter and Arthur Weasley travel to Harry's disciplinary hearing at the Ministry of Magic. Choosing to travel by Muggle public transport was a security measure to avoid drawing unwanted attention. The journey through the station provides a moment of comic relief, showcasing Mr. Weasley's enthusiastic but clumsy interactions with the Muggle world, which temporarily distracts Harry from the anxiety of his impending trial. Upon exiting the station, they emerge onto a broad street lined with impressive buildings, from which they locate the secret visitors' entrance to the Ministry of Magic—a disguised red telephone box. This establishes the station as the primary public gateway for visitors needing to access the Ministry without using magical transport like the Floo Network.