How fast does BART go under the bay?

During peak commute times, over 28,000 passengers per hour travel through the tunnel with headways as short as 2.5 minutes. BART trains can reach their highest speeds in the tube, up to 80 miles per hour (129 km/h), although trains typically operate at 70 miles per hour (113 km/h) unless trying to recover from a delay.



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BART has 8 DMU train cars which each have a seating capacity of 104. 70 mph maximum; 35 mph average, including 20-second station stops. For BART to Antioch DMU trains, the maximum speed is 75 mph; 60 mph average.

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Earthquake Safety Program The Transbay Tube is BART's most critical asset. Although the tube is structurally sound, in a very large and very rare earthquake, the outer shell and concrete liner are predicted to crack.

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It goes through an immersed tube, the Transbay Tube. The tube is made of two tunnels for trains, and a gallery which people can walk through, in case, say, a train derails. The immersed tube was built on land, and submerged after. It opened on September 11, 1972.

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In many places, it's not much deeper than a swimming pool. In between Hayward and San Mateo, it's a mere 12 inches. Under the Golden Gate Bridge, however, the depth reaches just over 370 feet.

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When it rains, BART also alters its computer programs to slow the acceleration of trains in certain areas to prevent them from spinning their wheels. But those delays, he said, are typically less than 30 seconds. It's nothing that would be noticed by passengers, he said.

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Core BART trains are 100% electric. As the trains brake, BART trains convert their kinetic energy of motion into electrical energy. Some of the energy regenerated during the process is returned to the power distribution system, where it is then used by other trains.

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Seats are scrubbed with hot water and disinfectant soap during a thorough clean. BART recently increased the frequency of thorough cleans from every 900 hours of train car service to every 450 hours, meaning we've doubled the number of times the cars in our system undergo a deep clean.

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Taking the train has long been less expensive than driving when considering bridge tolls and parking — and now it's an even more affordable option when you consider most Bay Area gas stations are charging more than $6 a gallon.

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In celebration of BART's upcoming 50th anniversary on September 11, BART is offering a 50% discount for the entire month of September 2022. The reduced fare will be automatically deducted when using Clipper at the fare gates.

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The Alcatraz swim is approximately two miles from Alcatraz Island to the St. Francis Yacht Club in San Francisco. Due to the added difficulty of swimming in the open water compared to pool swimming, you should be able to at least 2-2.5 miles in a pool.

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Underneath the Golden Gate Bridge lies the wreck of the City of Chester, a steamboat that sank on August 22, 1890 at 10 a.m. The boat was impaled on the steamer Oceanic, arriving from Asia, and sunk in six minutes.

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