Boston's transit agency, the MBTA, plans to replace diesel trains on the Fairmount Line with battery-powered ones by 2030. The deal, worth an expected $765 million, covers seven trains built by the Swiss company Stadler, leased for 15 years. The 10-mile line running through Dorchester and Mattapan will see more frequent stops, moving from every 30 minutes to every 20, and the agency says the switch will cut 17,700 tons of carbon dioxide emissions a year compared to diesel.
Battery trains let transit systems go electric without stringing overhead power lines, called catenary, which is expensive and complex to install. San Francisco's Caltrain system switched to electric trains (using overhead lines) in 2024 and saw commute times drop by up to 23 percent, ridership rise 60 percent, and riders' exposure to harmful soot particles fall 89 percent. Chicago and the Bay Area's Caltrain are also testing battery trains, though the technology hasn't yet proven itself on busy routes anywhere in the world.
For homeowners, this is a regional transit story rather than one tied to home energy upgrades or rebates. It mainly matters if you live near the Fairmount Line or another commuter line being considered for electrification, where cleaner, quieter, more frequent trains could be on the way in the coming years, along with less diesel exhaust in the surrounding air.
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