The Metropolitan Transportation Authority says Metro-North signal crews have installed new safety protections at the Spuyten Duyvil curve, the site of last Sunday’s derailment in the Bronx that killed four people.

The MTA said the new protections — which will start Monday — will warn engineers of approaching speed reductions and will automatically apply the train’s emergency brakes if speed is not lowered to the 30 mph maximum in the curve.

Metro-North engineers are also developing new signal protections to “automatically enforce speed restrictions” at four other critical curves by March and at five movable bridges by September.

The other critical curves are Yonkers on the Hudson Line, White Plains on the Harlem Line and Port Chester and Bridgeport on the New Haven Line. All five movable bridges are on the New Haven Line.

Starting Tuesday, Metro-North will also require that conductors stand with engineers at the control cab through the critical curves and bridges and verbally confirm that speed limits are adhered to.

(AP)