Here are some benefits (pros) and drawbacks (cons) of the two projects which many see as competing with each other for funding: the North South Rail Link (or NSRL) and the South Station Expansion (SSX).

North South Rail Link

Pros:

Aimed at improving commuter rail travel systemwide Would make it possible to transfer between all commuter rail lines Frees up valuable downtown land that would otherwise be used for railyards Makes Boston an integral hub connecting Eastern Seaboard

Cons:

More costly…