The Federal Railroad Administration published a notice of availability and request for comments on a request for amendment (RFA) submitted by the Peninsula Corridor Joint Powers Board (Caltrain) on January 29, 2025, to its FRA-approved Positive Train Control Safety Plan (PTCSP). The RFA seeks FRA approval of proposed material modifications to Caltrain's Interoperable Electronic Train Management System (I-ETMS) and its highway grade crossing system, including Crossing Optimization and Two-Speed Check Gate Crossing Warning Activation System. This is a procedural regulatory notice, not a NEPA environmental review; no environmental impacts or alternatives are analyzed.1