Transit officials say a section of rail that snapped and caused a New York City subway train to derail had been installed just weeks ago.

The Metropolitan Transit Authority said Saturday that the rail that broke underneath an F train in Queens on Friday was manufactured in the U.S. in November. It was installed in March.

Emergency medical personnel assist a woman who was evacuated from a subway train after it derailed in the Queens Friday. (AP Photo/Julie Jacobson)

The MTA says other rails from that shipment will be inspected.

About 1,000 commuters were on board the train when it rode off the rails at 10:15 a.m.

Nineteen people were injured, four seriously. Several hundred were trapped on the train below ground for hours.

MTA workers are repairing a damaged 500-foot stretch of rail and aim to have local service restored by Saturday afternoon.