To establish a National Freight Network Trust Fund to improve the performance of the national freight network, and for other purposes.

National Freight Network Trust Fund Act of 2015 Amends the Internal Revenue Code to establish the National Freight Network Trust Fund, from which expenditures shall be made to fund awards under the National Freight Network Grant Program. Appropriates to the Fund amounts equivalent to 5% of the import duties imposed under the Harmonized Tariff Schedule of the United States. ...