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Subchapter 20. Tunnel Safety Orders
Article 17. Transportation and Haulage
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§8471. Locomotives.

(a) All haulage locomotives shall be equipped with an audible signal or warning bell, horn or whistle, which shall be maintained in a workable condition.

(b) Locomotives and other powered rail-mounted equipment shall be provided with a throttle or control which returns the engine to idle or shuts off the power automatically whenever it is released.

(c) Electric locomotives must be equipped with some type of constant pressure control that shuts off the power automatically and applies the brakes when released if the operator leaves his/her post or compartment.

(d) Operators of locomotives hauling occupied mantrips or loaded explosive cars shall have at least one year of experience in operating locomotives underground.

(e) Tops of locomotives shall have raised edges or equivalent at their sides to prevent tools from rolling or falling off or protruding over the sides.

(f) Locomotives shall be equipped with steps or footboards. Steps and footboards shall be made of nonslip material and handholds shall be provided. No person shall ride on any part of locomotives not so equipped.

(g) Exposed or unguarded trolley wires shall not be used in supplying power to underground equipment at tunnel construction projects except where the project is an alteration or repair of an existing tunnel already equipped with such wires or one to be permanently so equipped.

(1) Whenever rails serve as a return for a trolley circuit, both rails shall be bonded at every joint and crossbonded every 200 feet (60.96 m).

(h) All locomotives and powered rail-mounted equipment shall be provided with a fail-safe secondary braking system which is not dependent on any external source of power or pressure to maintain the braking action. This brake shall be set at any time the operator is not at the controls.

NOTE: Authority cited: Sections 142.3 and 7997, Labor Code. Reference: Sections 142.3 and 7997, Labor Code.


1. Amendment of section and new Note filed 3-5-96; operative 4-4-96 (Register 96, No. 10).

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