BART turns 50, celebrates with announcement that Transbay Tube is earthquake strong – The Mercury News

BART turned 50 years old on Monday and, to celebrate, transit agency officials announced that the earthquake retrofit of the Transbay Tube is complete.

Officials say the BART system, which has ferried millions of passengers across the San Francisco Bay for five decades, is now stronger and more resilient than ever.

“The best birthday gift we could ask for,’’ a spokesperson said in a statement.

When the 3.6-mile-long tube between San Francisco and Oakland opened on Sept. 16, 1974, it was the longest immersed tube in the world and it’s been deemed BART’s “most valuable asset.” But to withstand a major earthquake, BART said the tube needed upgrades. Those improvements cost about $313 million and took about seven years to complete.

BART worked with earthquake retrofit specialists using a combination of geotechnical and structural site investigations, computer simulations and testing of materials and models to develop the retrofit design, a spokesperson said.

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