California Code, Public Utilities Code - PUC § 7665.6

(a) Secure all facilities that handle or store hazardous materials by providing adequate security personnel.

(b) Store hazardous materials only in secure facilities designed for storage, which shall not include mainline, branch, industrial, or passing tracks not so designed or retrofitted.

(c) Shall not leave locomotive equipment running while unattended, or leave any unattended locomotive equipment unlocked.

(d) Shall ensure that the cabs of occupied locomotives are secured from hijacking, sabotage, or terrorism.

(e) Shall not use remote control locomotives to move hazardous materials over a public crossing unless the remote control operator is able to maintain line-of-sight visibility of the public crossing and visually ensure that all automatic highway-rail grade crossing warning devices are functioning as intended, and it is safe for the train movement to enter the public crossing.

(f) Shall secure remote control devices to prevent access to those devices by unauthorized personnel.