Any railroad corporation which is involved in an incident resulting in a release, or threatened release, of a hazardous material shall immediately report the type and extent of the release or threatened release in the manner specified in Section 25507 of the Health and Safety Code.
Source:
Section 7672.5, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=PUC§ionNum=7672.5..