amendment The chapter analysis for chapter 201 is amended by adding at the end the following: 20172. Certification of signal employees. . 11. Wayside detections technology (a) Wayside detection technologies defined Section 20102 of title 49, United States Code, is amended by adding at the end the following: (5) wayside detection technologies means— (A) any devices and equipment situated within the rail system that can detect and communicate a potential or known safety condition