Wis. Stat. § 195.34

Every water carrier shall report to the office all accidents resulting in injury to persons arising from its operation. The office may issue rules concerning the reporting of accidents by water carriers and may also, if public interests require, cause an investigation of any accident. Every railroad shall submit to the office a copy of any accident or injury report provided by the railroad to the applicable federal authority for all collisions, derailments or other accidents resulting in injury to persons, equipment, or roadway arising from its operation. The office may issue rules concerning the submission of copies of federal reports under this section and RAILROAD AND WATER CARRIER REGULATION 195.509 may also, to the extent permitted by federal law, participate in any accident investigation.