六郷川橋梁, Railway bridge in Ota, Japan
The Rokugogawa Bridge (六郷川橋梁) is a railway bridge on the Tokaido Main Line crossing the Tama River between Ota district in Tokyo and Kawasaki in Kanagawa Prefecture. The steel structure runs about 519 meters (1,700 feet) in length and carries trains on one of the main rail routes between Tokyo and Osaka.
The first bridge at this site was built in 1872 as Japan's earliest railway bridge, designed with the help of British engineers. The current steel structure is the result of several rebuilds, with the last version completed in 1971.
The bridge sits on one of the busiest rail corridors in Japan, and trains cross it at a steady pace throughout the day. From the riverbank, visitors can watch trains pass above the water in both directions, which gives a clear sense of how central this line is to daily movement between Tokyo and Kanagawa.
The bridge can be seen clearly from the walking paths along both banks of the Tama River, and nearby footbridges offer open views of the steel structure. Since the bridge carries active train traffic, access onto it is not possible, but the riverside paths are easy to reach on foot.
When the second version of the bridge was replaced, its steel spans were not scrapped but moved and reused in the Sakawagawa Bridge on the Gotemba Line. This kind of material transfer between bridges was rare in early railway construction and shows how engineers found ways to extend the life of older structures.
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