Section 238.743 - Emergency lighting(a) Except as provided in paragraph (b) of this section, Tier III trainsets shall comply with the emergency lighting requirements specified in § 238.115 .(b) Emergency lighting back-up power systems shall, at a minimum, be capable of operating after experiencing the individually applied accelerations defined in either of the following paragraphs:(1) Section 238.115(a)(4)(ii) ; or(2) Section 6.1.4, "Security of furniture, equipment and features," of GM/RT2100, provided that- (i) The conditions of § 238.705(b)(2) are met;(ii) The initial shock of a collision or derailment is based on a minimum load of 5g longitudinal, 3g lateral, and 3g vertical; and(iii) Use of the standard is carried out under any conditions identified by the railroad, as approved by FRA.(c) Railway Group Standard GM/RT2100, Issue Four, "Requirements for Rail Vehicle Structures," December 2010, is incorporated by reference into this section with the approval of the Director of the Federal Register under 5 U.S.C. 552(a) and 1 CFR part 51 . All approved material is available for inspection at Federal Railroad Administration, Docket Clerk, 1200 New Jersey Avenue SE, Washington, DC and is available from Rail Safety and Standards Board Ltd., Communications, RSSB, Block 2 Angel Square, 1 Torrens Street, London, England EC1V 1NY, www.rgsonline.co.uk. It is also available for inspection at NARA. For information on the availability of this material at NARA, call 202-741-6030 or go to www.archives.gov/federal-register/cfr/ibr-locations.html.