A sleepy Sunday afternoon in Prosperity, South Carolina, turned into a jumble of traffic reroutes and flashes of red railroad-crossing lights after a CSX train derailed there.

CSX spokeswoman Jane Covington said 20 of the 99 cars on the train, which was carrying coal from Erwin, Tenn., to Cayce, derailed at 2:23 p.m. No one was injured, and Covington said many of the cars were still upright on the tracks.

Covington could not explain why the train derailed because the investigation was not complete.

The train started a series of small fires in Newberry County before derailing.

Prosperity Fire Chief Mark Bowers said grass fires began at four locations: half a mile out of Prosperity on S.C. 76, downtown at Shiloh and Brown roads, and in two locations in the upper part of Newberry County.

The S.C. Forestry Commission had to plow a path to the train tracks for firefighters to reach the fire downtown, Bowers said.

Bowers said friction from something on the train ignited the fires, which were confined to grass and wood. No homes were in danger, he said. Firefighters from Prosperity, Fairfield and Little Mountain responded.

Sheriff James Lee Foster said the fires happened before the derailment.