Freight Trust Fund to carry out this section an amount equal to 50 percent of the receipts of the Freight Trust Fund for each fiscal year beginning in fiscal year 2018. (k) Administration and oversight costs The Secretary may retain up to one-half of 1 percent of the amounts available to carry out this section for each fiscal year for the cost of administration and oversight of projects funded under this section. (l) Availability of funds Amounts authorized under subsection (j) shall be— (1) available for obligation on October 1 of the fiscal year for which they are authorized