[Code of Federal Regulations]
[Title 49, Volume 4]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR234.231]

[Page 529-530]
 
                        TITLE 49--TRANSPORTATION
 
       CHAPTER II--FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF 
                             TRANSPORTATION
 
PART 234_GRADE CROSSING SIGNAL SYSTEM SAFETY--Table of Contents
 
             Subpart D_Maintenance, Inspection, and Testing
 
Sec. 234.231  Fouling wires.

    Each set of fouling wires in a highway-rail grade crossing train 
detection

[[Page 530]]

circuit shall consist of at least two discrete conductors. Each 
conductor shall be of sufficient conductivity and shall be maintained in 
such condition to ensure proper operation of the train detection 
apparatus when the train detection circuit is shunted. Installation of a 
single duplex wire with single plug acting as fouling wires is 
prohibited. Existing installations having single duplex wires with a 
single plug for fouling wires may be continued in use until they require 
repair or replacement.