RED WING – A southbound Canadian Pacific train leaked a trail of about 12,000 gallons of crude oil Monday morning after passing through Red Wing, according to the Minnesota Pollution Control Agency.

MPCA emergency responders worked with railroad personnel throughout the day Tuesday to gauge the extent of the spill and check for environmental damage, MPCA spokeswoman Cathy Rofshus said.

She described the leak as a “light spray on the ballast rocks” that stretches for nearly 70 miles of track.

A duty officer’s report from the Minnesota Department of Public Safety says the leak started in Red Wing and continued past Winona before it was reported around 9 a.m. Monday. Crews reportedly stopped the train and fixed a missing valve or cap responsible for the spill.

Investigators spent the day Tuesday looking for areas where the oil may have pooled, but so far none has been found, Rofshus said.