Modifies provisions relating to crew member requirements for certain rail operations

The bill title and abstract indicate it modifies crew member requirements for certain rail operations, but the provided abstract does not specify the nature of these modifications (e.g., increasing, decreasing, or changing qualifications) or identify which rail operations are affected. No concrete policy changes, affected groups, or key mechanisms are described in the available information. As a procedural bill with insufficient detail in its abstract, a substantive summary cannot be provided.