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Overhead wires are way more expensive than you’d think. They’re also delicate — a tree branch knocks out a line of Boston’s light rail system every couple months.

Electrification of existing train lines is a huge initiative, and one with major benefits, but it’s still only slowly gaining traction. In fact, one of Boston’s train lines that is not electrified is opting for battery powered trains to avoid the costs of overhead wires!




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