Without a passenger rail link between North and South stations, the Massachusetts Bay Transportation Authority has only one quick route through Boston when it needs to move train cars for commuters around the network.
It’s called the Grand Junction Railroad, and it links the north and south tracks through a crossing over the Charles River near Boston University. The old railway is used to send out-of-commission trains from the south side of the commuter rail network to a maintenance facility near North Station; Amtrak also uses it to shift cars, while freight trains take the Grand Junction to Everett and Chelsea.
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