An emergency operation is under way after a truck crashed into a rail bridge in New South Wales’ Central West, leaving one person trapped.

Emergency services were called to Inch Street in Lithgow following reports of a truck crash about 8.50am.

Officers responded to find that a ‘cherry picker’ had hit the bridge, causing it to collapse.

A man believed to be the driver escaped the vehicle, however, a passenger remains trapped.

Emergency services remain at the scene and are working to free the man.