Police are concerned for the welfare of a 65-year-old man missing from Sedbergh near Kendal.
David Richardson is described as white with receding black hair, carrying a backpack.
Police say he is most likely near a train station or train lines, due to his interest in trains.
He was last seen in Sedbergh on Friday 16 December around 5:30pm.
Anyone with information is asked to get in touch with the police on 101.