The Delair Branch is a freight-only railway line in the United States.

It was originally part of the Pennsylvania Railroad system and is now owned by Conrail Shared Assets Operations.

In 1994, Conrail and Amtrak collaborated to make the southernmost track on the Northeast Corridor between Frankford Junction and the Schuylkill River freight-only.

At the western end, Conrail built a new connection to the Trenton Line.

[5] Conrail extended the "Delair Branch" westward to cover this new "line."