The Federal Railroad Administration published a notice of availability and request for comments on a request for amendment (RFA) submitted July 8, 2025, by the South Florida Regional Transportation Authority (SFRV) to its FRA-certified Positive Train Control Safety Plan and PTC system. SFRV seeks approval to temporarily disable its PTC system between Milepost SX1015.82 and SX1022.29 for approximately two days and six hours (September 19 to 22, 2025) to upgrade end-of-life wayside signal operating equipment. This is a procedural railroad safety notice, not a NEPA environmental review; no environmental impacts or mitigations are analyzed.12