Section 238.441 - Emergency roof access(a)Existing passenger cars and power cars. Each passenger car and power car ordered prior to April 1, 2009 and placed in service for the first time prior to April 1, 2011, shall have a minimum of one roof hatch emergency access location with a minimum opening of 26 inches by 24 inches, or at least one structural weak point in the roof providing a minimum opening of the same dimensions, to provide access for properly equipped emergency response personnel. Each emergency roof access location shall be conspicuously marked, and legible and understandable operating instructions shall be posted at or near each such location. On or after January 28, 2015, such markings shall also conform with the requirements specified in § 238.125 .(b)New passenger cars. Each passenger car ordered on or after April 1, 2009 or placed in service for the first time on or after April 1, 2011, shall comply with the emergency roof access requirements specified in § 238.123 .(c)New power cars. Each power car ordered on or after April 1, 2009, or placed in service for the first time on or after April 1, 2011, shall have a minimum of one emergency roof access location, with a minimum opening of 26 inches longitudinally by 24 inches laterally, and comply with the emergency roof access requirements specified in §§ 238.123(b), (d), and (e) . 73 FR 6412 , Feb. 1, 2008, as amended at 78 FR 71815 , Nov. 29, 2013