Amtrak's Adirondack operates over the full length, providing daily service between New York City and Montreal.

At Cantic, 5 miles (8.0 km) from Rouses Point, it connects with the Swanton Subdivision.

[1] Amtrak's Adirondack uses the entirety of the line, providing daily service between New York City and Montreal.

[7] In 1851, the Champlain and St. Lawrence built south from St. Johns to Rouses Point, New York.

[12] In 1960, construction of the Champlain Bridge prompted the Canadian National to abandon the northern 5 miles (8.0 km) of the original extension to Saint-Lambert.