This is a Federal Railroad Administration notice of availability and request for public comments on a joint request for amendment (RFA) submitted January 21, 2026, by Brightline Florida and Florida East Coast Railway to their FRA-approved Positive Train Control Safety Plans. The RFA seeks approval to implement I-ETMS Protect 77.0.4.0 software to improve system performance, along with corrections to the PTCSP and updates to line segment names. FRA may approve, approve with conditions, or deny the RFA at its sole discretion. This is a procedural notice; no environmental impacts or alternatives are analyzed.12