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Image courtesy of Canadian Pacific

A leaking tank car on a Canadian Pacific train left crude oil along 70 miles of track between Red Wing and Winona, Minnesota Monday.

About 12,000 gallons of oil leaked out before rail workers discovered a malfunctioning valve on the car. It was then north of Winona, according, to Cathy Rofshus, a spokesperson for the Minnesota Pollution Control Agency in Rochester.

Rofshus said leaking oil dripped through the ties on two railroad bridges into the Cannon and Zumbro rivers and left a light sheen.

The southbound tanker leaked less than half the crude it contained.

Most of leaking oil landed on ballast rock along the tracks.

Inspectors haven’t found any pooled oil from the leak, according to reports.