Cal. Civ. Code § 2178

A common carrier of property by steam or electric railroad which accepts for transportation, storage, handling or safe-keeping, as a part of or in connection with passenger transportation, property carried in trunks, valises, suit cases, traveling bags, boxes, bundles or packages, shall not be liable, in the event of loss of or injury to the same, for more than one hundred dollars for each trunk and contents, nor more than fifty dollars for each valise and contents, or suit case and contents, or traveling bag and contents, nor more than ten dollars for each box, bundle or package and contents, unless the carrier shall have consented in writing to assume a greater liability. The term “common carrier” as used in this section shall include sleeping car companies.