; relating to regulatory planning and review), existing safety regulations to ensure the safe transportation of goods and passengers by rail, including consideration of the impact that train length and weight have on the safe transportation of high-hazard trains. (b) Report Not later than 3 years after the date on which the Secretary submits the report required under subsection (a), if the Secretary has not addressed any recommendation contained within such report, the Secretary shall submit a report to the Committee on Commerce, Science, and Transportation of the Senate and the Committee on Transportation and Infrastructure of the House of Representatives that justifies such inaction. (c) Reporting requirement (1) In general The Secretary shall revise the existing railroad accident or incident reporting forms to require railroads to report the weight trailing tonnages of any train involved in a reportable accident or incident. (2) Publication The Federal Railroad Administration shall publish on its Rail Safety Data website a summary of all reportable incidents and accidents, categorized by train length and weight. 104. Blocked highway-rail grade crossings (a) Study The Secretary shall seek to enter into an agreement with the National Academy of Sciences under which the National Academy shall— (1) conduct a study of 20 most frequently blocked highway-rail grade crossings in not fewer than 10 different States, as determined by the Secretary based on— (A) Federal Railroad Administration data; (B) the work experience of the Office of Railroad Safety's Grade Crossing and Trespasser Outreach Division; (C) data from the blocked highway-rail grade crossing portal; and (D) geographic diversity