Why is BART so bumpy?
Why is BART so bumpy? Like most trains, BART wheels are tied together with rigid axels and no differentials. This means the wheels always rotate at the same speed, even around corners. Because the inner radius is smaller, there is less distance to travel, which can cause a slippage between the wheels and track, which is noisy.
What is the loudest train in London?
He added: 'The Central line has the loudest section out of all of the tube lines, and it basically gets as loud as almost 110dB. ' The Jubilee, Central, Victoria and Bakerloo lines were also recorded to be louder than 105dB on ten different occasions.
What happens to old BART trains?
The majority of the old cars will be recycled. The Fleet Disposition Team will manage the process, including selecting which parts should be harvested from retired vehicles and choosing which cars with the highest failure rates get retired first.
What would 170 decibels do to a human?
Sounds above 150 dB have the potential of causing life-threatening issues. Sounds between 170-200 dB are so intense that they can cause lethal issues like pulmonary embolisms, pulmonary contusions, or even burst lungs.
How deep underground does BART go?
Constructed in 57 sections, and reposing on the bay floor as deep as 135 feet beneath the surface, the remarkable $180 million structure took six years of toil and seismic studies to design, and less than three years to contract.
Is BART train noisy?
BART actually has a big machine that grinds down the bumps on corrugated track, eliminating some of the noise. This explains why sometimes a portion of the BART system makes loud uuunnnhhh sounds one day and doesn't make a peep the next. You aren't crazy -- they just smoothed out the track at night.
What mistake did BART make?
In the promotional video, the AI tool is asked “What new discoveries from the James Webb Space Telescope [JWST] can I tell my 9 year old about?” In its response, Bard answers that JWST took the “very first pictures” of an exoplanet outside our solar system.
Is it safe to BART at night?
Yes, but be watchful and mindful of your luggage. If someone seems sketchy or looks mentally unstable, then get up and move to another car.
What is the top speed of a BART train?
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.
Is it safe to ride BART?
Safety is BART's top priority. To help keep passengers and our employees safe, BART has more than 4,000 working cameras throughout our system and we are working very hard to increase both sworn officers and ambassador presence.
Why is BART so squeaky?
But because of the design, one of the wheels ends up getting dragged against the rail on turns, which causes that high-pitched squeal. “So one wheel has to be sliding while the other is rolling,” Kolesar says.
How many decibels is a BART train?
Noise. Many BART passengers have noted that the system is noisy, with a 2010 survey by the San Francisco Chronicle measuring up to 100 decibels (comparable to the noise level of a jackhammer) in the Transbay Tube between San Francisco and Oakland, and still more than 90 decibels in 23 other locations.
Why are trains easier to hear at night?
At night, the air near the ground can have a different temperature than air only a few hundred feet above1. This affects the transmission of sound waves. There is usually less ambient noise after dark, so the distant train sounds louder. As pointed out elsewhere, maybe the trains don't use the horn in daytime.
Why does BART slow down in the rain?
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.
Is it illegal to not pay for BART?
The BART Board of Directors passed the proof of payment requirement on October 26, 2017, to deter fare evasion. The new ordinance took effect January 1, 2018. Any person inside the paid area of BART must be prepared to show a magnetic stripe ticket or Clipper card with valid fare.
Are the new BART trains quieter?
Testing has shown a drop of as many as 20 decibels in sound intensity. One way to think about the difference is if the decibel level of riding on a BART train with the old wheel profile and rail sounded like standing near a lawnmower the new system is more like being next to a dishwasher.