; 6 U.S.C. 1161 et seq.) to— (1) assign rail carriers to high-risk tiers; and (2) establish a rail security training program. 4. Visible Intermodal Prevention and Response Teams (a) Authorization of appropriations Section 1303(b) of the Implementing Recommendations of the 9/11 Commission Act of 2007 ( Public Law 110–53 ; 6 U.S.C. 1112 ) is amended by striking fiscal years 2016 through 2018 and inserting fiscal years 2016 through 2020 . (b) Surface transportation security inspectors Section 1304(j) of the Implementing Recommendations of the 9/11 Commission Act of 2007 ( Public Law 110–53 ; 6 U.S.C. 1113 ) is amended by striking this section and all that follows and inserting this section such sums as may be necessary for each of fiscal years 2016 through 2020. . 5. Public transportation security research and development Section 1409(h) of the Implementing Recommendations of the 9/11 Commission Act of 2007 ( Public Law 110–53 ; 6 U.S.C. 1138 ) is amended by striking to make grants and all that follows and inserting to carry out this section such sums as may be necessary for each of fiscal years 2016 through 2020. . 6. Railroad security Section 1513(i)(1) of the Implementing Recommendations of the 9/11 Commission Act of 2007 ( Public Law 110–53 ; 6 U.S.C. 1163 ) is amended by striking Out of funds and all that follows and inserting: There are authorized to be appropriated to the Secretary to carry out this section such sums as may be necessary for each of fiscal years 2016 through 2020. . 7. Over-the-road bus security assistance Section 1532(k)(1) of the Implementing Recommendations of the 9/11 Commission Act of 2007 ( Public Law 110–53