[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: 49CFR229.69]

[Page 434]
 
                        TITLE 49--TRANSPORTATION
 
       CHAPTER II--FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF 
                             TRANSPORTATION
 
PART 229_RAILROAD LOCOMOTIVE SAFETY STANDARDS--Table of Contents
 
                      Subpart C_Safety Requirements
 
Sec.  229.69  Side bearings.

    (a) Friction side bearings with springs designed to carry weight may 
not have more than 25 percent of the springs in any one nest broken.
    (b) Friction side bearings may not be run in contact unless designed 
to carry weight. Maximum clearance of side bearings may not exceed one-
fourth inch on each side or a total of one-half inch on both sides, 
except where more than two side bearings are used under the same rigid 
superstructure. The clearance on one pair of side bearings under the 
same rigid superstructure shall not exceed one-fourth inch on each side 
or a total of one-half inch on both sides; the other side bearings under 
the same rigid superstructure may have one-half inch clearance on each 
side or a total of 1 inch on both sides. These clearances apply where 
the spread of the side bearings is 50 inches or less; where the spread 
is greater, the side bearing clearance may only be increased 
proportionately.