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5.25-inch floppy disks expected to help run San Francisco trains until 2030

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5.25-inch floppy disks expected to help run San Francisco trains until 2030


The San Francisco Municipal Transportation Agency (SFMTA), which runs the city’s Muni Metro light rail, claims to be the first US agency to adopt floppy disks. But today, the SFMTA is eager to abandon its reliance on 5¼-inch floppy disks—just give it about six more years and a few hundred more million dollars.

Members of the SFMTA recently spoke with the ABC7 Bay Area News and detailed the agency’s use of three 5¼-inch floppy disks every morning. The floppies have been part of Muni Metro’s Automatic Train Control System (ATCS) since its installation in the Market Street subway stop in 1998. The ATCS has multiple components, “including computers onboard the trains that are tied into propulsion and brake systems, central and local servers, and communications infrastructure, like loop cable signal wires,” Michael Roccaforte, an SFMTA spokesperson, told Ars Technica.

The floppy disks are for loading the software running the central servers, Roccaforte said:

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When a train enters the subway, its onboard computer connects to the train control system to run the train in automatic mode, where the trains drive themselves while the operators supervise. When they exit the subway, they disconnect from the ATCS and return to manual operation on the street.

Roccaforte said initial planning for an overhaul of the ATCS, including moving off floppy disks, started in 2018 and was expected to take a decade from initial planning to completion. Because of an 18-month-long COVID-19-related hiatus, completion is expected in 2029 to 2030. SFMTA expects to settle on a contractor by early 2025 and will release a detailed project timeline then.

“Ultimately, our goal is to have a single train control system for the entire rail system,” Jeffrey Tumlin, SFMTA’s director of transportation, told ABC7.

Floppy flaws

“If it ain’t broke don’t fix it,” some say. But while the floppy disk-reliant train control system is currently working, there are challenges to relying on the dated technology, which SFMTA has highlighted for years.

The transportation body says the train control system was built to last for just 20 to 25 years, meaning it surpassed its expected lifetime in 2023. In 2020, the Muni Reliability Working Group, said to be composed of local and national transit experts, recommended replacing the transit control system within five to seven years.

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When asked how “dire” it is to upgrade off of floppy disks, Tumlin told ABC7 that it’s all about risk.

“The system is currently working just fine, but we know that with each increasing year, risk of data degradation on the floppy disks increases and that at some point there will be a catastrophic failure,” Tumlin told ABC7.

Previously, the transportation agency claimed that the ATCS had become harder and more expensive to maintain over time. It has also discussed the challenges it has in finding workers who know how to use the dated system.

“We have to maintain programmers who are experts in the programming languages of the ’90s in order to keep running our current system, so we have a technical debt that stretches back many decades,” Tumlin told San Francisco’s KQED in February 2023.

In 2020, a company spokesperson told the San Francisco Chronicle that the SFMTA’s transportation controller graduation rate at the time was 40 to 50 percent.

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When asked if moving off floppies would result in job losses, Roccaforte told Ars:

With the new train control system, there will still be plenty of work for [current] staff, and they will be trained in the new technology. A key part of our project strategy is to develop in-house skill sets and training for existing staff. In addition, we’ll [need] to hire more skilled positions, such as signaling engineers, to help support the new train control system.



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San Francisco, CA

Oakland Airport’s ‘San Francisco’ rebrand has failed to reverse plunging passenger numbers

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Oakland Airport’s ‘San Francisco’ rebrand has failed to reverse plunging passenger numbers


The controversy over the Oakland airport’s addition of San Franisco to its name brought headlines, but not travelers, even during the typically frenzied holiday season. 

Passenger traffic at OAK (now officially known as Oakland San Francisco Bay Airport) dropped steeply over the past year, even as air travel nationwide held steady and its rival to the west seeing record numbers. 

The naming controversy generated publicity and a tiff with San Francisco International Airport, but not the desired increase in traffic. In the 12 months through September 2025, approximately 8.2 million people passed through OAK for domestic flights — 1.8 million, or 17%, fewer than in the previous year, according to federal data (opens in new tab). Passenger traffic was down 15.5% (opens in new tab) in the first three quarters of 2025.

International travel showed a bump, but with limited routes to only Mexico and El Salvador.

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The drop at OAK is happening as domestic travel around the country has remained flat, according to the Bureau of Transportation Statistics (opens in new tab).

In fact, Oakland’s decline in the first half of 2025 was the worst of all 93 major U.S. airports, according to LocalsInsider.com (opens in new tab). The second-sharpest drop was at Chicago’s Midway, which was 12.9% off from the previous year.

The decline in passengers isn’t tied to fewer flights being offered. OAK data shows just 56 fewer so-called “airplane movements” through September compared with last year, a negligible 0.03% decrease out of more than 153,000 flights.

Why the dropoff?

The Port of Oakland, which operates the airport, says people aren’t traveling for work anymore. 

“Like all of the industry, the decline at OAK can be attributed to the decline in business travel,” said Kaley Skantz, a port spokesperson.

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But Collin Czarnecki, who leads Locals Insider’s research on airlines, ties the troubles to a larger industry trend: the death of the middle-class airport. 

“Overall, the ‘why’ is sort of this bigger picture,” he said. “Secondary hubs and midsize airports are seeing a lot of change with low-cost carriers.”

Despite the declines, OAK is moving forward with a major makeover and adding 16 gates because of a previous forecast (opens in new tab) that annual passenger levels would reach 24.7 million in 2038. Current traffic has yet to match 2019 levels. 

Meanwhile, for San Francisco’s airport, the outlook is sunny. 

With its nonstop flights to the East Coast, Europe, and Asia, SFO is in a different class. The airport showed 5.1% growth in 2025 from 43.5 million to 45.7 million passengers, according to its own data (opens in new tab). SFO also boasted that it had its busiest Thanksgiving travel season on record. OAK officials said they lacked the daily data to analyze Thanksgiving traffic.

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SFO representatives attribute the gains to the airport’s  mix of domestic and international flights and business and leisure travelers. 

“Drilling down further, the diversity of our international service is a real advantage, as our fortunes aren’t tied strictly to the performance of one specific market,” SFO spokesperson Doug Yakel said.

Business owners near OAK say they don’t get much lift from their proximity to the travel hub. Alan Liang, who owns a Mexican restaurant, a burger joint, a towing company, and an auto repair shop in a plaza along Hegenberger Road, said about 95% of his customers are blue-collar workers with jobs nearby. 

“I never came across anyone who said, ‘I’m here in town and came to get a bite,’” said Liang. Crime has scared away customers and led to the closure of chain restaurants like In-N-Out Burger, Black Bear Diner, and Denny’s.

“A few decades ago, Hegenberger primarily benefited from the traffic flow from the airport,” he said. “It’s extremely hard for me to believe that today.”

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The fortunes of Oakland’s airport are intertwined with the popularity of Southwest Airlines, which accounts for 83.3% of OAK’s passengers, according to federal statistics. Spirit Airlines had been the airport’s second-largest carrier, with nearly 6% of travelers, but the company in October pulled out of Oakland (opens in new tab), as well as San Jose.

To stabilize its position and grow, OAK should strive to become a hub for a major airline like Delta or American, according to Linchi Kwok, a Cal Poly Pomona professor who specializes in travel and tourism. 

“It would bring a lot more traffic and draw customers who are loyal to the airline,” said Kwok. “Everyone can benefit from healthy competition.”



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San Francisco’s Union Square sees holiday boost as Winter Walk begins

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San Francisco’s Union Square sees holiday boost as Winter Walk begins


With only 12 days before Christmas, San Francisco is ramping up the holiday spirit. On Saturday evening, they kicked off the Union Square Winter Walk, an outdoor space designed to bring life and customers back to the struggling retail center.

It’s hard not to succeed in business when you can get hundreds of Santa Clauses converging on the area. The annual SantaCon has become the city’s most popular pub crawl, with everyone decked out like Saint Nick.

“We started coming here a couple years ago. You know, get some holiday cheer going,” said one SantCon partier named John.  “And it’s just, like, seeing hundreds of Santas on the street, it’s just a sight to see. It’s a fun time, it’s a fun time.”

“I’m very confused,” said his friend Julian Schiano, also in a Santa suit.  “I have no idea how this started. They invited me out.  I requested the day off, so, had a little bit of fun. But, I have no idea about how this started or anything, but it seemed like a good day to get away from everything.”

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“It is so much fun,” said Wendy Solorio from San Jose. “You get to mingle and meet a whole bunch of festive people.”  

So, what makes them so festive?  

“It’s actually right here,” she said, holding up her drink.

With so many people coming each year, the Union Square Alliance uses it as the kick-off to its Winter Walk festival, which will continue through Christmas Eve. Two blocks of Stockton Street are decked out in blue outdoor turf, with food trucks, pop-up stores and winter-themed photo ops.

“We have records of Winter Walk from 2016, where it was holiday decor, and the turf was out here,” said Holly Chiao with the Alliance, “but it’s really grown to what it is now in 2025. And we’re so happy with how it turned out.”

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It actually started in the 2014 Christmas season when someone got the simple idea of closing off the street and covering it in green artificial turf.  They were amazed at how much fun people were having with just a wide-open place to play.  And now they’ve carried the idea on to become a bona fide holiday tradition.

“Look around,” said Chiao. “I mean, people come down to Union Square to celebrate life’s greatest moments. And for something this big and interactive, for all the friends and family and loved ones to come together, putting this on, year after year, is so important for us for, for overturning that negative narrative around Union Square, around San Francisco.  And that’s what keeps us going.”

The shopping district is still trying to recover from the pandemic and a high-profile rash of retail crime.  Many stores have left, and the flagship Macy’s says it’s on its way out.  But for those still operating, Mayor Daniel Lurie had good news.  Crime is way down, he said, and there is a renewed sense of hope in Union Square and across the City.

“San Francisco, y’all, it’s happening. It is happening,” he said to the cheering crowd.  So, listen, the world is starting to know, and get to know, that we are not only on the way back, but we’re going to be back to our rightful spot of being the greatest city in the world again.  And, I’ll close with this: let’s go, San Francisco.”

Retail still has its challenges, but it can’t hurt for San Francisco’s premier shopping destination to have a few cheerleaders. That, and a couple of hundred Santas.

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First Alert Weather Saturday morning forecast 12-13-25

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First Alert Weather Saturday morning forecast 12-13-25




First Alert Weather Saturday morning forecast 12-13-25 – CBS San Francisco

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