Lots of people dream of the Old West, but have to settle for movies and daydreams. Not so this week, when the arrival of the Hashknife Pony Express provided a time-honored touch of days when the West was growing in spurts and fits and starts. The original Pony Express carried the mail on horseback from St. Joseph, Mo. to Sacramento, Calif. — a legendary time that left tales of courage, misadventure and speedy delivery. The actual delivery service involved 120 riders, 184 stations, 400 horses and hundreds of personnel. It didn’t last long until the railroad supplanted it, but it has persisted in legend for generations.