[Code of Federal Regulations]
[Title 49, Volume 4]
[Revised as of October 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR234.231]

[Page 624]
 
                        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 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.