[6] Under Amtrak, the train made intermediate stops between New London and New Haven at Niantic, Old Saybrook, Clinton, Madison, Guilford, Leete's Island, Stony Creek, Pine Orchard, and Branford.

[6] On October 14, 1971, Amtrak announced their intent to discontinue the Clamdigger, citing ridership of just 66 passengers per train — not enough to fill the single Budd RDC.

[7][2] The Rail Passenger Service Act (RPSA) forbade Amtrak from discontinuing any train which formed part of its "basic system" until mid-1973.

[14] The train made intermediate station stops only at Kingston, Westerly, Mystic, New London, and Old Saybrook, limiting its usefulness for commuters.

[4]: 32 The Clamdigger was reinstated on January 8, 1978, with commuter-based flag stops added at Groton, Clinton, Madison, Stony Creek, and Branford.

Shore Line East serves mostly the same station stops as the original Clamdigger, but thanks to modernized equipment and higher frequency it has been more successful.