49 CFR § 229.301
Purpose and scope
November 18, 2020
(a) The purpose of this subpart is to promote the safe design, operation, and maintenance of safety-critical, as defined in §229.305, electronic locomotive control systems, subsystems, and components.
(b) Locomotive control systems or their functions that comingle with safety critical processor based signal and train control systems are regulated under part 236 subparts H and I of this chapter.