OMAHA, Neb. (AP) — Weak coal demand is still weighing on Norfolk Southern Corp’s profits, and executives at the railroad said Tuesday it’s extremely difficult to predict when coal shipments will increase.

The railroad based in Norfolk, Va., said its fourth-quarter profit declined 14 percent to $413 million, or $1.30 per share. That’s down from $480 million, or $1.42 per share, a year earlier.