HARRISBURG (TNS) — Cleanup is nearly complete after about a dozen Norfolk Southern train cars derailed in Harrisburg Saturday afternoon.

In a statement to PennLive Sunday afternoon, Norfolk Southern said its mainline is back online, meaning the main track used for trains to connect from Harrisburg to other cities is fully operational. It was shut down Saturday after ten cars derailed.

The railroad did not say what caused the derailment. The derailed cars did not contain hazardous materials but the incident raises concerns about future derailments that could create a toxic mess like the one in 2023 involving Norfolk Southern in East Palestine, Ohio.

In that case, a defective wheel bearing was blamed for sending 38 rail cars off the tracks, including 11 rail tank cars carrying hazardous materials that polluted the water, ground and air.

Last year, some people were still reporting respiratory problems, rashes or headaches, or saying they felt ill whenever they returned to the village not far from the Pennsylvania border.

In Harrisburg, at least one tank car and five boxcars were involved in the derailment, which happened around 3 p.m. and prompted a response from Harrisburg Bureau of Fire Squad 8 and Tower 1.

There were no reports of a hazmat situation and the train’s crew members were safe, the company said.