Summary: This document provides the public notice that on March 24, 2022, Union Pacific Railroad (UP) petitioned the Federal Railroad Administration (FRA) to transition from phase 1 to phase 2 of a previously approved test program and associated temporary suspension of some visual track inspections. The Test Program is designed to test track inspection technologies (i.e., an autonomous track geometry measurement system) and new operational approaches to track inspections (i.e., combinations of autonomous inspection and traditional visual inspections).