Kachidokibashi bridge awarded engineering heritage title：The Asahi Shimbun

A standout bridge over the lionized Sumidagawa river in Tokyo has been designated a Mechanical Engineering Heritage property.

The Kachidokibashi bridge was at the cutting edge of Japanese manufacturing when it was built 77 years ago.

The designation means it has been recognized as a technologically and historically important asset.

Another six items including Japan’s first domestically produced subway car were selected as heritage properties.

The Japan Society of Mechanical Engineers (JSME) certified them on Aug. 7, which itself is labeled "Machinery Day."

Mechanical Engineering Heritage was set up in 2007 by the JSME, and it has so far certified 90 items as heritage properties.

Kachidokibashi bridge, a bascule bridge measuring 246 meters in length, was opened to traffic in 1940. The bridge connects the Tsukiji district where the famed Tsukiji fish market lies with the Kachidoki district that now contains a cluster of skyscraping apartment blocks.

Bascule bridges are moveable, and the two parts that shifted on either side each weigh about 1,000 tons. The axle on each side is 7.4 meters in radius and motors were used to power the lifting process.

The bridge's movements came to a stop in 1970 when cargo trucks replaced ships as the main transportation method in the area.

The electric subway car that was also designated as a Mechanical Engineering Heritage property was No. 1001 of the Mo Ha 1000 Series.

The train was first manufactured in Japan and used when Japan went full scale in underground transportation. It was one of the train cars out of 10 that were used from December 1927 by Tokyo Underground Railway Co., the predecessor of Tokyo Metro Co.

The electric subway car is on display at the Tokyo Metro Museum in Tokyo’s Edogawa Ward.

Another designation went to the Shinkai 2000, a manned deepwater research submarine, which was completed in 1981 and in operation through 2002. The Shinkai 2000 is currently exhibited at the Enoshima Aquarium, symbolizing the history of deep-sea exploration and ocean development.

In addition, Okuda Tunnel's longitudinal flow ventilation system by jet fans got the nod for a designation. The 641-meter-long tunnel is in Kita-Kyushu, Fukuoka Prefecture, and the ventilation system was state of the art when first installed in 1966.

The square fingertip fully automatic glove knitting machine, the ACW-M-1 multihead weighing device and the Type C-11 of green sand molding machine also were awarded designations.

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