This is a Federal Railroad Administration notice of availability and request for public comment on Trinity Railway Express's (TRE) request to amend its Positive Train Control Safety Plan (PTCSP), Version 2.0, submitted October 30, 2024. TRE seeks FRA approval to reclassify its Interoperable Electronic Train Management System (I-ETMS) as a mixed PTC system under 49 CFR 236.1015(e). This is a regulatory approval proceeding, not a NEPA environmental review; no alternatives or environmental impacts are analyzed. Comments are due by February 10, 2025, via Docket No. FRA-2010-0044.12