49 U.S. Code § 20164 - Development and use of rail safety technology
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(a) In General.— Not later than 1 year after enactment of the Railroad Safety Enhancement Act of 2008,  the Secretary of Transportation shall prescribe standards, guidance, regulations, or orders governing the development, use, and implementation of rail safety technology in dark territory, in arrangements not defined in section 20501 or otherwise not covered by Federal standards, guidance, regulations, or orders that ensure the safe operation of such technology, such as—
(b) Dark Territory Defined.— In this section, the term “dark territory” means any territory in a railroad system that does not have a signal or train control system installed or operational.
 See References in Text note below.