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In page Big Dig:
"The original Big Dig plan also included the North-South Rail Link, which would have connected North and South Stations (the major passenger train stations in Boston), but this aspect of the project was ultimately dropped by the state transportation administration early in the Dukakis administration. Negotiations with the federal government had led to an agreement to widen some of the lanes in the new harbor tunnel, and accommodating these would require the tunnel to be deeper and mechanically-vented; this left no room for the rail lines, and having diesel trains (then in use) passing through the tunnel would have substantially increased the cost of the ventilation system.[4]
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