The main purpose of this legislation is to cancel a specific safety rule that was established by the Federal Railroad Administration regarding the size of train crews. The rule in question aimed to set safety requirements for the number of crew members needed on trains. The key provision of this legislation is straightforward: it nullifies the final rule on train crew size that was published on April 9, 2024. This means that the regulations outlined in that rule will no longer be in effect, allowing for changes in how train crews are staffed.