Southern California Regional Rail Authority's Request To Amend Its Positive Train Control System

Southern California Regional Rail Authority's Request to Amend Its Positive Train Control Safety Plan and Positive Train Control System

The Federal Railroad Administration (FRA) published a notice of availability on July 16, 2025, announcing that the Southern California Regional Rail Authority (SCAX) submitted a request for amendment (RFA) on July 7, 2025, to its FRA-approved Positive Train Control Safety Plan and certified PTC system. The RFA seeks FRA approval to modify the PTC braking algorithm as a result of updates to onboard PTC software. This is a procedural regulatory notice; no environmental impacts or mitigations are analyzed. Public comments are due by August 5, 2025, via Docket No. FRA-2010-0048.

Southern California Regional Rail Authority's Request To Amend Its Positive Train Control System

The Federal Railroad Administration (FRA) published a notice of availability on June 20, 2024, announcing that Metrolink (Southern California Regional Rail Authority) submitted a request for amendment (RFA) on June 7, 2024, to its FRA-certified Interoperable Electronic Train Management System (I-ETMS). The RFA seeks approval of a temporary I-ETMS outage to support pre-revenue service vehicle acceptance testing on a new vehicle type. FRA invites public comment through July 10, 2024. This is a procedural regulatory notice, not a NEPA environmental review document; no alternatives or environmental impacts are analyzed.