49 CFR Part 238
§ 238.709 — Fluid entry inhibition
FRA Part 238 · Subpart H — Specific Requirements for Tier III Passenger Equipment. Full current text with cross-references on BuildSpec.
§ 238.709 Fluid entry inhibition. (a) The skin covering the forward-facing end of a Tier III trainset shall be— (1) Equivalent to a 1/2-inch steel plate with yield strength of 25,000 pounds per square inch. Material of higher yield strength may be used to decrease the required thickness of the material provided at least an equivalent level of strength is maintained. The sum of the thicknesses of elements (e.g., skin and structural elements) from the structural leading edge of the trainset to a point, when projected onto a vertical plane, just forward of the engineer's normal operating…
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