; (2) to alter the terms or interpretations of existing collective bargaining agreements; or (3) to abridge any procedural rights or remedies provided under a collectively bargained agreement. 106. Emergency brake signals (a) In general Not later than 30 days after the date of the enactment of this Act, the Administrator of the Federal Railroad Administration shall convene a meeting of the Railroad Safety Advisory Committee for the purpose of considering a regulatory safety task on the functioning of emergency brake signals. (b) Purpose The Railroad Safety Advisory Committee shall consider— (1) the sufficiency of the regulations under part 232 of title 49, Code of Federal Regulations, with regard to end-of-train and head-of-train device communications; (2) whether National Transportation Safety Board Safety Recommendations R-20-028 and R-20-029 have been adequately addressed; (3) whether more frequent communication checks between a head-of-train device and an end-of-train device would improve rail safety; and (4) whether repetition of the emergency brake signal transmission until it is received by the end-of-train device would improve rail safety. (c) Recommendations and work plan Not later than 90 days after the meeting is convened pursuant to subsection (a), a working group of the Railroad Safety Advisory Committee should— (1) develop initial recommendations with respect to the matters considered under subsection (b)