A westbound grain train derailed Tuesday on the southern border of Glacier National Park, spilling 29 cars of corn near Essex.

At 11:45 MDT on April 20, BNSF train G-SIOPAS1-15 derailed the 29 cars at Java, Montana 54 miles east of Whitefish, Montana blocking both main tracks.

According to Gus Melonas, spokesman for the Burlington Northern Santa Fe Railroad, no one was injured in the crash.

"We've not determined the cause yet," Melonas said. "We're still working on that."

Melonas said the train was traveling from Sioux City, Iowa, to Pasco, Wash. The tracks are blocked, he said, and will not be cleared until noon Wednesday at the earliest.

Amtrak, Melonas said, is busing passengers around the wreck, between Shelby and Spokane, as the derailment has shut down rail service in the U.S. Highway 2 corridor between East Glacier and West Glacier.

Four locomotives were pulling 110 corn cars, he said, when the accident occurred.

"It is believed the fifth through the 34th cars derailed," he said.

About 10 are in a ditch on the north side of the track, he said, and the remaining 19 derailed cars "are accordianed on the road bed."

A crew of 35 workers is expected to work through the evening clearing the track, he said. "We're bringing in large bulldozers and equipment from Whitefish, Billings and Havre."

Other tools will be trucked in to vacuum the spilled corn, Melonas said. Some of the tipped cars might be put upright and removed via rail, he said, but most will be "shoved aside and removed over the next couple weeks."

The stretch of rail on Glacier's southern border has proved a tricky route for BNSF trains in recent months. In late January, avalanches derailed a train there, upending 15 grain cars.

In that accident, three locomotives were pulling 119 empty grain cars from Washington to Great Falls, he said, when the train was knocked from the tracks about three miles from Essex. No one was injured.