[Code of Federal Regulations] [Title 49, Volume 4] [Revised as of October 1, 2005] From the U.S. Government Printing Office via GPO Access [CITE: 49CFR238.221] [Page 671-672] 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. 238.221 Glazing. (a) Passenger equipment shall comply with the applicable Safety Glazing Standards contained in part 223 of this chapter, if required by that part. [[Page 672]] (b) Each exterior window on a locomotive cab and a passenger car shall remain in place when subjected to: (1) The forces described in part 223 of this chapter; and (2) The forces due to air pressure differences caused when two trains pass at the minimum separation for two adjacent tracks, while traveling in opposite directions, each train traveling at the maximum authorized speed.