PART 221—REAR END MARKING DEVICE—PASSENGER, COMMUTER AND FREIGHT TRAINS
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This part applies to passenger, commuter and freight trains when operated on a standard gage main track which is part of the general railroad system of transportation prescribes minimum requirements governing highly visible marking devices for the trailing end of the rear car of all passenger, commuter and freight trains. So long as these minimum requirements are met, railroads may adopt additional or more stringent requirements for rear end marking devices.
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Notwithstanding the provisions of this part, a State may continue in force any law, rule, regulation, order,or standard that was in effect on July 8, 1976, relating to lighted marking devices on the rear car of freight trains except to the extent that such law,rule, regulation, order, or standard would cause such cars to be in violation of this part
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the marking devices prescribed by this sub part shall be illuminated continuously or flash during the period between one hour before sunset and one hour after sunrise, and during all other hours when weather conditions so restrict visibility that the end silhouette of a standard boxcar cannot be seen from 1⁄2 mile on tangent track by a person having 20/20 corrected vision
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Marking devices prescribed by this part and equipped with a functioning photoelectric cell activation mechanism shall illuminate or flash the device continuously when there is less than 1.0 candela per square meter of ambient light
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The centroid of the marking device must be located at a minimum of 48 inches above the top of the rail
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Whenever the marking device prescribed in this part becomes inoperative enroute, the train may be moved to the next forward location where the marking device can be repaired or replaced
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