[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: 49CFR238.227]

[Page 723]
 
                        TITLE 49--TRANSPORTATION
 
       CHAPTER II--FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF 
                             TRANSPORTATION
 
PART 238_PASSENGER EQUIPMENT SAFETY STANDARDS--Table of Contents
 
     Subpart C_Specific Requirements for Tier I Passenger Equipment
 
Sec.  238.227  Suspension system.

    On or after November 8, 1999--
    (a) All passenger equipment shall exhibit freedom from hunting 
oscillations at all operating speeds. If hunting oscillations do occur, 
a railroad shall immediately take appropriate action to prevent 
derailment. For purposes of this paragraph, hunting oscillations shall 
be considered lateral oscillations of trucks that could lead to a 
dangerous instability.
    (b) All passenger equipment intended for service above 110 mph shall 
demonstrate stable operation during pre-revenue service qualification 
tests at all operating speeds up to 5 mph in excess of the maximum 
intended operating speed under worst-case conditions--including 
component wear--as determined by the operating railroad.
    (c) Nothing in this section shall affect the requirements of part 
213 of this chapter as they apply to passenger equipment as provided in 
that part.