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In page Common carrier:

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The person that is physically transporting the goods on a means of transport is referred to as the "actual carrier". When a carrier subcontracts with another provider, such as an independent contractor or a third-party carrier, the common carrier is said to be providing "substituted service". The same person may hold both common carrier and contract carrier authority. In the case of a rail line in the US, the owner of the property is said to retain a "residual common carrier obligation", unless otherwise transferred (such as in the case of a commuter rail system, where the authority operating passenger trains may acquire the property but not this obligation from the former owner), and must operate the line if service is terminated.[citation needed]