Crews have successfully removed all of the oil products off six tanker cars that teetered on a broken rail bridge over the swollen Bow River in Calgary.
Ed Greenberg of Canadian Pacific Railway confirmed the product, used to dilute raw oilsands bitumen, did not leak into the river.
He says crews are now preparing to remove the derailed units by stabilizing them while locomotives positioned on each side of the damaged bridge will pull the cars safely to each side.
Greenberg says that should be completed by Friday morning.
Mayor Naheed Nenshi had earlier chastised Canadian Pacific for the derailment, which happened in the wee hours Thursday.
But later he said the rail company had apologized for the chaos, which added to tensions in the flood-ravaged city.
CP engineers at the scene said the bridge had actually been inspected 18 times since flooding began.
But company CEO Hunter Harrison says they did not send divers down to look because the water was moving so fast.
He says it would have been "jeopardizing commerce" to hold back the train.
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The six cars were part of a train that derailed on southeast Calgary's Bonnybrook rail bridge around 3:45 a.m. MT. They were at risk of falling into the fast-moving Bow River, but officials tethered the cars together so they dangled over the water.
The bridge initially buckled and dropped about half a metre.
Heavy machinery was moved in around noon and crews set up pumps to extract material from the derailed cars.
Five of the rail cars contained petroleum diluent, which is used to thin petroleum products, including bitumen from Alberta oilsands, for transporting through a pipeline.