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Seven CSX cars – six of them carrying crude oil – derailed on a 128-year-old bridge over the busy Schuylkill Expressway Monday.

But none of the tanker cars leaked or caught fire.

Jacksonville, Fla.-based CSX said in a statement it didn’t know what caused the derailment of the train traveling from Chicago to Philadelphia.

Seven of the 101 freight cars near the rear of the train derailed.

There were no injuries and no cargo was released, CSX said.

A full tanker car contains nearly 700 barrels of crude.

“The oil was headed to Philadelphia Energy Solutions, the historic South Philadelphia refinery reopened last year by a joint venture of prior owner Sunoco and the Carlyle Group, christening a new $100 million rail terminal and creating more than 1,000 jobs,” the Philly Daily News said.

Railroads and energy companies agreed last week to make voluntary safety changes in shipping crude oil.

The U.S. Department of Transportation oversaw meetings of executives from the railroads and the industry group American Petroleum Institute. The groups set out steps for enhanced safety of crude oil shipments by rail.

Last month a crude train derailed and exploded near Casselton, N.D. There were no injuries but most of the town’s 2,300 were forced to evacuate while a toxic cloud spread over the area.

In July, a derailment and explosion in Lac-Megantic, Quebec killed 47 people and destroyed much of the town.

In November, a train hauling Bakken crude from North Dakota derailed and exploded in Alabama, spilling more than 700,000 gallons of oil from 26 tanker cars. No one was killed in that accident.

Two weeks ago, a crude train derailed in northwestern New Brunswick, Canada and erupted in a fireball that forced the evacuation of about 60 people in the sparsely populated area.