[Code of Federal Regulations]
[Title 49, Volume 4]
[Revised as of October 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR236.13]

[Page 491]
 
                        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. 236.13  Spring switch; selection of signal control circuits through circuit controller.

    The control circuits of signals governing facing movements over a 
main track spring switch shall be selected through the contacts of a 
switch circuit controller, or through the contacts of relay repeating 
the position of such circuit controller, which, when normally closed 
switch point is open one-fourth inch or more, will cause such signals to 
display their most restrictive aspects, except that where a separate 
aspect is displayed for facing movements over the switch in the reverse 
position the signal shall display its most restrictive aspect when the 
switch points are open one-fourth inch or more from either the normal or 
reverse position.