Arakawa-Nakagawa Bridge, Railway bridge in Edogawa district, Japan

The Arakawa-Nakagawa Bridge is a 1,236 m steel railway bridge on the Tokyo Metro Tozai Line between Minami-Sunamachi and Nishi-Kasai stations, crossing both the Arakawa and the Nakagawa. It consists of 16 simple through Warren truss spans, painted light blue, with a central 150 m span carried by a three-span continuous gerber truss. A single white pylon with fanned cables stands near the centre, and the deck runs slightly skewed to the river with a gentle curve and a gradient on the west side.

The bridge opened on 29 March 1969, built for the Teito Rapid Transit Authority with trusses made by Tokyo Tekko Kyoryo and Yokogawa Bridge. Its 1,236-metre length made it the longest railway bridge in Japan not owned by the former Japanese National Railways until the Kansai International Airport connection opened in 1994. The piers were driven to a depth of 72 metres to reach firm ground.

The bridge links Tokyo's eastern neighborhoods and serves as a daily crossing for commuters between residential and commercial districts. For local residents, it represents a routine part of their journey through the city.

The bridge carries frequent train traffic throughout the day, with services running between the two end stations. Visitors can view the structure from nearby riverbanks or from passing trains.

On 28 February 1978 at 21:34, a train of the 5000 series (set 5818F, ten cars) was hit by tornado-force winds on the bridge; the last three cars derailed and two of them overturned, injuring 23 people.