DISAPPOINTING DELIVERY: CSX railroad said its fourth-quarter profit declined 5 percent to $426 million, or 42 cents per share. CONTINUED COAL CONCERN: CSX says coal revenue slid another 9 percent to $679 million in the fourth quarter. Demand for coal has remained weak for the past couple years largely because of cheap natural gas prices. PROMISING GROWTH: Even with the declining coal shipments, CSX said its overall volume increased 6 percent.