The main purpose of this legislation, known as the "One Seat Ride Act," is to direct the Secretary of Transportation to study the costs and benefits of commuter rail services that allow passengers to travel without needing to transfer trains. This aims to improve the convenience and efficiency of commuter rail travel. Key provisions of the act include a requirement for the Secretary of Transportation to identify the advantages of commuter rail services and the significant challenges that prevent the implementation of direct, non-transfer trips for passengers.