49 CFR §238.711
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
The cab ends of Tier III trainsets shall comply with the requirements of appendix F to this part to demonstrate the integrity of the end structure. For those units of Tier III trainsets without identifiable corner or collision posts, the requirements of appendix F to this part apply to the end structure at each location specified, regardless of whether the structure is a post.