Again on the Track. - The engine Empire, that run off the track the day before yesterday near American Flat Tunnel, was replaced yesterday morning, and all freight trains are now running on time.
Mail Delayed. - Owing to a freight train getting off the track, on the western division of the Central Pacific Railroad, four miles west of Reno, no mailes were received in this city yesterday from any direction until about 8 o'clock in the evening. The train on the Virginia and Truckee waited at Reno all day, hourly expecting that the mail and passenger train from California would get in.