[Code of Federal Regulations]
[Title 49, Volume 4]
[Revised as of October 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR234.265]

[Page 493]
 
                        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. 234.265  Timing relays and timing devices.

    Each timing relay and timing device shall be tested at least once 
every twelve months. The timing shall be maintained at not less than 90 
percent nor more than 110 percent of the 41 predetermined time interval. 
The predetermined time interval shall be shown on the plans or marked on 
the timing relay or timing device. Timing devices which perform internal 
functions associated with motion detectors, motion sensors, and grade 
crossing predictors are not subject to the requirements of this section.