; (5) whether any macroeconomic or other conditions exist or have existed under which it has been difficult for the Federal Railroad Administration to fill safety inspector and specialist vacancies, and the degree to which special rates of pay or other recruitment and retention practices could ameliorate or could have ameliorated such difficulty; and (6) recommendations for any reforms that could— (A) improve the recruitment, hiring, and retention of Federal Railroad Administration safety inspectors and specialists, including potential quality of life and workplace improvements; (B) improve Federal Railroad Administration workforce management processes; or (C) increase the capacity for inspection activities, if such capacity is identified as deficient, at the Federal Railroad Administration, including activities relating to the transportation of hazardous materials. 116. Office of Personnel Management review of safety inspector and specialist classifications (a) Revising railroad safety series Not later than 270 days after the date of the enactment of this Act, the Director of the Office of Personnel Management shall— (1) complete a review of the Railroad Safety Series, GS–2121, TS-37; and (2) subject to subsection (b), revise the series referred to in paragraph (1), as appropriate, to reflect factors impacting the Federal Railroad Administration’s oversight of the railroad industry, including— (A) current critical Federal Railroad Administration disciplines