NEWARK, Del. (CBS) – Police are investigating a tractor-trailer and freight train collision in Newark, Delaware.

According to police, the tractor-trailer and train collided shortly before 2 p.m. Friday afternoon at the intersection of West Main Street and Elkton Road as the driver of the tractor-trailer attempted to make a delivery at a restaurant just over the rail crossing.

Police say the truck was parked on the sidewalk as the crossing arms began to lower onto the trailer signalling an oncoming train.

Allegedly the driver, identified as 42-year-old Joseph C. Mounts of Felton, DE, tried to drive the truck away from the crossing but was hit on the passenger side by the train.

Police closed Main Street at South College Avenue and Westbound West Main Street at Hillside Road. They were reopened around 5:30 p.m.

Paramedics say the driver of the tractor-trailer stuck in the wreckage for about 20 minutes before being freed by firefighters. He was treated by paramedics for head and internal injuries and taken to Christiana Hospital in critical condition.

No other injuries have been reported. The investigation is ongoing.

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