This document contains performance requirements and recommendations for electrical lighting systems in the interiors of mainline passenger vehicles, under all operating and emergency conditions. This document also defines the requirements for testing and conformity assessment. This document applies only to new units. This document does not apply retrospectively to existing vehicles for reasons of refurbishment or renewal unless agreed between Contractors. This document does not address lighting installed in instruments or controls. This document does not address requirements for the lighting of boarding aids, for example, moveable steps, bridging plates, or lifts. This document does not address lighting installed for indication or effect purposes, including flashing lights, ambient mood lighting, and decorative lighting.