Rule 27 — Signal Imperfectly Displayed

1. (a)Except as provided in paragraph (b), a fixed signal which is imperfectly displayed, or the absence of a fixed signal where one is usually displayed, must be regarded as the most restrictive indication that such signal is capable of displaying. An imperfectly displayed signal must be communicated to the proper authority as soon as possible.
2. (b)Where a block or interlocking signal is observed with one or more lights extinguished, and at least one light remains displaying either green or yellow, movements may proceed reducing to SLOW speed through turnouts, when practicable, preparing to stop at the next signal. EXCEPTION: Where a signal displays a solid yellow on the bottom position and one or all of the remaining positions are extinguished, a movement approaching such signal operating: must consider the signal as displaying RESTRICTING.
3. (c)When a signal is known or suspected of being damaged, it must be regarded as displaying the most restrictive indication that can be given by that signal.
4. (d)When a block or interlocking signal displays an indication that is in other than the normal progression in relationship to the indication of the advance signal to that signal, the movement must stop immediately consistent with safe train handling practices and contact the RTC or signalman for further instructions.
5. (e)Repairs to damaged signals must not be made by other than qualified employees. Signals that have been knocked over must not be re-erected by other than an authorized employee. If it is known or suspected that a signal bungalow has been damaged, such fact must be reported to the RTC immediately.

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