Cal. Code Regs. tit. 8, § 7024 – Mine Trains--Equipment and Practice.

(a) (9-9) Every locomotive shall be provided with an audible warning device capable of being heard at a distance of 200 feet. Such a warning device shall be maintained in good working condition.
Operators shall sound warning before starting trains, when trains approach crossings or other trains on adjacent tracks, and where vision is obscured.
(b) Locomotives or trains operating at night shall be equipped with front and rear lights.
(c) Locomotives shall be equipped at both ends with adequate footboards and grab irons.
(d) (9-48) Every locomotive shall be equipped with brakes of sufficient capacity to control the train with reasonable safety and railroad cars with braking systems shall be equipped with effective brake shoes.
(e) (9-3) Before a locomotive is moved, the engineer shall make certain that the brakes are in operating condition. When the locomotive is not in operation the hand brake shall be set.
(f) No locomotive shall be left unattended unless it is locked or otherwise made inoperable.
(g) (9-98) Locomotives and cars moved by locomotives that are coupled and uncoupled in the course of their regular operation shall be equipped with automatic couplings with extension handles.
(h) Dump cars shall be equipped with positive locking devices to prevent accidental dumping.
(i) (9-97) Couplings shall not be shifted or lined up on moving cars or locomotives. If the couplings are not in line, the car or locomotive shall be stopped before they are shifted. Employees shall not stand on the rail while coupling or uncoupling cars.
(j) (9-47) When cars are uncoupled from a train they shall be secured against accidental movement.
(k) (9-45) No materials shall be carried on any locomotive unless such locomotive is equipped so that the materials can be carried safely.
Materials may be carried on locomotives equipped with fixed boxes or trays or with raised edges high enough to keep the materials safely in place.
No material that extends over the side or end of a locomotive shall be carried on the locomotive.
(l) (9-45) The material on loaded cars shall be balanced and trimmed in order to prevent dislodging during transportation.
(m) Railroad equipment shall not be operated at a speed which will endanger employees.
(n) (9-50) Railcars shall not be left on side tracks unless ample clearance is provided for traffic on adjacent tracks.
(o) (9-51) Persons shall not go over, under, or between cars unless the train is stopped and the motorman has been notified and the notice acknowledged.
(p) (9-52) Inability of a motorman to clearly recognize his brakeman's signals, when the train is under the direction of the brakeman, shall be construed by the motorman as a stop signal.
(q) (9-54) A bumper or other device that will effectively prevent cars from going over the end of the track shall be provided at all dump points for ore or waste.
(r) (9-54) Safety chains, or other equally effective devices, shall be used to keep the cars from overturning while being dumped.