| Wal-Mart and other retailers warn after weak December (Reuters) [8 mins][Mart, TX] Reuters - Wal-Mart Stores Inc and other top U.S. retailers delivered disappointing December same-store sales and profit warnings on Thursday, sparking fresh recession concerns that hit stock and currency markets. | Rail faults 'not due to upgrade' [55 mins][Greymouth] Power failures on the West Coast rail line were not caused by a new faster train timetable, says an inquiry. |