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