| North-south Rail Link |
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| mbta commuter rail | |
The North-South Rail Link is intended to fill this gap. In the current plan, a two-pronged tunnel would form from the two approaches to South Station, the one from the southwest (via Back Bay Station) and the one from the south. It would run under the existing South Station with a stop and then continue underground, underneath the Central Artery , which had walls built underneath it for the Rail Link as part of the Big Dig . A new Central Station would be built at Aquarium to transfer to the MBTA Blue Line . The tunnel would continue north, with a stop under the existing North Station, and resurface on the north side of the Charles River . Like Philadelphia 's SEPTA system after the similar Center City Commuter Connection tunnel was built and connected two commuter rail systems, Boston's trains would be Through-routed from one side of the system to the other. ALTERNATIVES Currently the MBTA uses the Grand Junction Line for non-revenue moves between the two sides of its network. The line splits from the Worcester Line near Boston University and crosses the Charles River to Cambridge . From there it runs to Somerville and connects to the commuter rail lines running from North Station. The line is single-tracked and slow with a large number of grade crossings. Several of the crossings lack gates, requiring trains to come to a complete stop before proceeding. If it were to be upgraded, right-of-way is limited and the corridor has been proposed as part of the Urban Ring project. Additionally only Worcester Line trains would be directly served. Trains from other southern lines on would have to detour and reverse to reach it. A Monorail between South and North Stations has been proposed. This would eliminate one transfer for travel between the two stations, but would still require a transfers at each end. EXTERNAL LINKS
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