MISSOULA, Mont. -

Train traffic is running again on a Montana Rail Link (MRL) line after a derailment earlier this week.

Twenty-three cars derailed along a steep embankment near Superior early Wednesday morning.  Four empty cars ended up in the Clark Fork River.

MRL spokesperson Lynda Frost said traffic resumed around 10:30 a.m. Friday. Frost said traffic will be heavy for the next 12 to 24 hours.

Removal of the train cars in the water and on the hill won't start until Monday. Frost said that could take as long as a week.

A boat safety crew from the Whitewater Rescue Institute is docked upriver from the wreckage. Frost said the crew will stay put through the weekend to keep boaters and floaters on the opposite side of the river from the debris.