Boston's Battery-Powered Trains Save Air Quality in 2030

When Marvin Martin saw a train full of passengers speed through his Dorchester neighborhood without stopping, he decided to change his community's transit future.

That was 1995. Martin noticed the Fairmount Line commuter trains rolled past communities of color, forcing residents onto crowded buses while others rode comfortably into downtown Boston. He started pushing the Massachusetts Bay Transportation Authority for better service.

It took 15 years, but the agency added three stops in Dorchester by 2013 and another in Mattapan in 2019. Martin wasn't done, though. He wanted those trains to stop polluting the air his neighbors breathed.

Nearly three decades after Martin's first glimpse of that passing train, Boston is making it happen. The transit agency plans to lease seven battery-powered trains for the Fairmount Line starting in 2030, replacing diesel engines that spew toxic particles into residential neighborhoods.

The Swiss-built trains will carry passengers every 20 minutes instead of every 30, making the service faster and more reliable. They'll save 17,700 tons of carbon dioxide emissions each year compared to the old diesel trains.

Boston joins a small but growing group of cities betting on battery power. Caltrain in the San Francisco Bay Area plans to introduce battery trains by 2028, and Chicago's Metra has a similar timeline.

The technology lets transit agencies electrify without installing expensive overhead power lines. Battery trains in Germany are already carrying 2 million people annually on a 50-mile route, proving the concept works.

The Ripple Effect

The Fairmount project could transform how American cities think about commuter rail. For decades, transit agencies avoided electrification because diesel seemed cheaper and simpler than installing miles of overhead wires.

Now rising fuel prices are changing that calculation. Diesel costs $6.32 per gallon today, up from $3.70 a year ago. Battery trains offer a middle path between old diesel engines and expensive catenary systems.

The benefits extend beyond Boston's Fairmount Line. Cleaner air means healthier lungs for residents living near the tracks, especially children and elderly people most vulnerable to pollution. Quieter trains mean less noise disrupting homes and schools.

More frequent service means people can rely on trains instead of cars, reducing traffic congestion throughout the region. And if the technology works as planned, other cities with aging diesel commuter lines could follow Boston's lead.

Boston actually pioneered electric transit once before. Its first electric streetcar rolled out in 1889, and the Tremont Street Subway became the first electric subway in North America. The city is coming full circle, returning to cleaner technology with modern innovation.

Martin, who recently retired from his transit advocacy work, will finally see his vision realized when those battery trains start running through his neighborhood.