Read More: New York's MTA Unveils Universal Subway Wireless Connectivity Plan
An Inside Look at the Partnership that Will Boost SFMTA's Mobile Coverage
Boldyn Networks is delivering next-generation communication services across the Bay Area with its recently announced partnership with AT&T.

Through this partnership, millions of passengers will be getting improved wireless connectivity across tunnels, stations, railcars, and surrounding areas.
Photo: SFMTA
AT&T and Boldyn Networks recently announced they are bringing coverage expansion for the San Francisco Municipal Transportation Agency (SFMTA).
Through this partnership, millions of passengers will be getting improved wireless connectivity across tunnels, stations, railcars, and surrounding areas.
Benefits of the AT&T, Boldyn Networks Partnership
Transport connectivity benefits the community by delivering connectivity-driven enhancements to residents and businesses across the Bay Area, according to Christos Karmis, CEO of Boldyn Networks’ U.S. business.
“The SFMTA network we’ve deployed helps improve the passenger experience, enables operational efficiencies, and boosts public safety,” Karmis said. “The SFMTA network also extends our existing high-density fiber footprint in the region, delivering the backbone required to improve 5G wireless connectivity, data center access, and enable connected buildings with indoor 5G coverage.”
Karmis also explained how this partnership developed.
“Our expertise in delivering 5G connectivity for some of the world’s largest and most complex transit systems in the U.S. and globally, coupled with BART’s commitment to enhancing the customer experience through their digital transformation initiatives, made us ideal partners to improve broadband connectivity for riders of the Central Subway system,” he added.
Boldyn Networks' Past Partnerships
Boldyn Networks has partnered with transit agencies in the past to bring connectivity to some of the biggest subway systems in the world, including the SFMTA and BART in the Bay Area, Sound Transit in Seattle, the MTA in New York City, TfL in London, UK, and more.
Highlights from past partnerships include:
In 2020, Boldyn Networks deployed its wireless connectivity infrastructure for Seattle’s Sound Transit multi-phase light rail system as part of the largest transit expansion project in the country.
On the East Coast, Boldyn deployed its cellular and Wi-Fi connectivity across New York City’s underground metro system, including a dedicated 4.9 GHz public safety band licensed to the Metropolitan Transportation Authority (MTA).
Boldyn Networks also transformed London's Underground “Tube” when it partnered with Transit for London (TfL) to bring 4G and 5G wireless connectivity to the city's passengers.
In Hong Kong, Boldyn Networks brought connectivity to the Mass Transit Railway (MTR) system, including connectivity for autonomous trains on the South Island Line.
Boldyn Networks is deploying connectivity across the BART system, including its “Fleet of the Future” trains.
“We look forward to sharing more on upcoming projects as we continue to expand our connected transport portfolio,” Karmis said.
More Technology

From Hardware to Digital Partner: Luminator Charts Its Next Chapter
CEO Magnus Friberg discusses Luminator’s shift toward becoming a digital partner, the growing importance of software and interoperability, and how AI can help agencies improve operations and passenger experience.
Read More →
Beyond the Checklist: A Structured Approach to Transit Maintenance
Reliability-Centered Maintenance helps transit agencies move beyond routine checklists to focus limited resources on the assets and failures that have the greatest impact on safety, reliability, and service.
Read More →
NJ TRANSIT Advances Bus Technology Upgrades Across Statewide Fleet
More than 1,500 buses now feature upgraded technology designed to improve arrival predictions and provide free Wi-Fi, with deployment expected to reach nearly 2,000 buses by the end of 2026.
Read More →Building a Flexible Path to Transit Electrification
John Hroncich discusses BAE Systems’ modular and scalable approach, lessons learned from decades of real-world operations, and how agencies can identify electrification strategies that fit their fleets.
Read More →
Biz Briefs: Alstom Lands Canadian Contract, LYT to Supply California TSP, and More
In METRO's latest installment, we take a look at recent news from Complete Coach Works, Beep, FlixBus, and more partnerships making headlines across the transportation sector.
Read More →
From Legacy Silos to Conversational Intelligence
What if transit leaders could ask any operational question and get a trusted answer in seconds? Conversational AI is transforming how agencies use their data.
Read More →
USDOT Announces Rail Vehicle Replacement Grants, Chattanooga AV Shuttle Funding
More than $191 million in federal funding will help three transit agencies replace aging rail vehicles and support a new autonomous shuttle service in Chattanooga.
Read More →
Bus Tech Talk: Keeping Transit Technicians Ahead of the Technology Curve
LA Metro’s Obed Mejia discusses technician training, evolving maintenance technology, fleet replacement, and strategies for getting the most out of today’s transit fleets.
Read More →
Biz Briefs: RIPTA Unveils New Frontrunners, Clevland RTA Adds New Siemens, and More
In METRO's latest installment, we take a look at recent news from Siemens, Prevost, Dodge, and more partnerships making headlines across the transportation sector.
Read More →
Why Simulating Pedestrian Movement Has Become Essential for Modern Rail Stations
Pedestrian microsimulation is helping rail planners identify bottlenecks, test station designs, and prepare complex transit hubs for growing passenger volumes.
Read More →
