[Code of Federal Regulations]

[Title 49, Volume 4]

[Revised as of October 1, 2005]

From the U.S. Government Printing Office via GPO Access

[CITE: 49CFR236.23]



[Page 591-592]

 

                        TITLE 49--TRANSPORTATION

 

       CHAPTER II--FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF 

                             TRANSPORTATION

 

PART 236_RULES, STANDARDS, AND INSTRUCTIONS GOVERNING THE INSTALLATION, 

INSPECTION, MAINTENANCE, AND REPAIR OF SIGNAL AND TRAIN CONTROL SYSTEMS, 

DEVICES, AND APPLIANCES--Table of Contents

 

              Subpart A_Rules and Instructions: All Systems

 

Sec. 236.23  Aspects and indications.



    (a) Aspects shall be shown by the position of semaphore blades, 

color of lights, position of lights, flashing of lights, or any 

combination thereof. They may be qualified by marker plate, number 

plate, letter plate, marker light, shape and color of semaphore blades 

or any combination thereof, subject to the following conditions:

    (1) Night aspects of roadway signals, except qualifying 

appurtenances, shall be shown by lights; day aspects by lights or 

semaphore arms. A single white light shall not be used.



[[Page 592]]



    (2) Reflector lenses or buttons or other devices which depend for 

visibility upon reflected light from an external source shall not be 

used hereafter in night aspects, except qualifying appurtenances.

    (b) The aspects of cab signals shall be shown by lights or by 

illuminated letters or numbers.

    (c) Each aspect displayed by a signal shall be identified by a name 

and shall indicate action to be taken. Only one name and indication 

shall apply to those aspects indicating the same action to be taken; the 

same aspect shall not be used with any other name and indication.

    (d) The fundamental indications of signal aspects shall conform to 

the following:

    (1) A red light, a series of horizontal lights or a semaphore blade 

in a horizontal position shall be used to indicate stop.

    (2) A yellow light, a lunar light, or a series of lights or a 

semaphore blade in the upper or lower quadrant at an angle of 

approximately 45 degrees to the vertical, shall be used to indicate that 

speed is to be restricted and stop may be required.

    (3) A green light, a series of vertical lights, or a semaphore blade 

in a vertical position in the upper quadrant or 60[deg] or 90[deg] in 

the lower quadrant shall be used to indicate proceed at authorized 

speed.

    (e) The names, indications, and aspects of roadway and cab signals 

shall be defined in the carrier's Operating Rule Book or Special 

Instructions. Modifications shall be filed with the FRA within thirty 

days after such modifications become effective.

    (f) The absence of a qualifying appurtenance, the failure of a lamp 

in a light signal, or a false restrictive position of an arm of a 

semaphore signal shall not cause the display of a less restrictive 

aspect than intended.



[33 FR 19684, Dec. 25, 1968, as amended at 49 FR 3383, Jan. 26, 1984]