(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. (1) Section 238.115(a)(4)(ii); or

2. (2) Section 6.1.4, “Security of furniture, equipment and features,” of GM/RT2100, provided that—

   1. (i) The conditions of § 238.705(b)(2) are met;
   2. (ii) The initial shock of a collision or derailment is based on a minimum load of 5g longitudinal, 3g lateral, and 3g vertical; and
   3. (iii) Use of the standard is carried out under any conditions identified by the railroad, as approved by FRA.