The Massachusetts Bay Transportation Authority (MBTA) has approved Keolis’s plan to operate battery-electric trains on the Fairmount Commuter Rail Line.
https://railway-news.com/us-mbta-approves-plan-for-battery-electric-commuter-trains/
Currently, train frequency during daytime is once per 30 mins. But, when it comes to improving train frequency, electrification will be needed. Electric Battery Train would be better than current diesel train though, I wonder if charging time at Boston South Station is enough.
