1. (a) As specified in § 238.705(a)(4), this appendix provides input data and a geometrical depiction necessary to create a computer model of the rigid locomotive design for use in evaluating the occupied volume integrity of a Tier III trainset in a dynamic collision scenario. (This appendix may also be applied to a Tier I alternative passenger trainset to evaluate its occupied volume integrity, in accordance with appendix G to this part).

2. (b) The input data, in the form of an input file, contains the geometry for approximately the first 12 feet of the rigid locomotive design. Because this input file is for a half-symmetric model, a locomotive mass corresponding to 130,000 pounds of weight is provided for modeling purposes—half the 260,000 pounds of weight specified for the locomotive in § 238.705(a)(4). Figure 1 to this appendix provides two views of the locomotive's geometric depiction. The input data is contained in appendix C to FRA's Technical Criteria and Procedures Report, available at https://railroads.dot.gov/elibrary/technical-criteria-and-procedures-evaluating-crashworthiness-and-occupant-protection#p4__z50__gD__lRT.

   

[83 FR 59229, Nov. 21, 2018, as amended at 90 FR 28187, July 1, 2025]