Last year I argued that one of our priorities for transportation in the New York area should be to increase clearances in the Haverstraw tunnel so that the West Shore Line can be double-tracked again. In Bellows Falls, Vermont they had a similar issue: a single-track tunnel constructed in 1851 right under the village green.
The tunnel was too low to allow double-height trains to pass through, so in 2007 the engineers did what they had previously done back in 1897 and 1987: dig further down to lower the track bed. It cost them $2 million, and allowed 5,000 additional freight cars per year to pass through the tunnel. The Vermont AOT has a Word document with some cool photos. So why can't we do this in Haverstraw?