four small leather sacks holding the mail were each six by twelve inches, one being fastened at the front and the other at the rear of the saddle, so that the rider sat between them. The pouches were impervious to rain, and for further protection, the letters were wrapped in oiled silk and then sealed. The pouches themselves were locked, not to be opened until they reached their destination. It was ordered from the first that they and their contents should never weigh more than twenty pounds. A rider might carry several hundred letters on each trip, for all were written on the finest of tissue paper. The postage at first was five dollars for each letter, later reduced as the building of the telegraph line progressed, to one dollar an ounce. In addition to this enormous postage, the merchants who were awaiting the important missives joined in paying the carrier a liberal fee, when he maintained the schedule or made quicker time than usual.
Mr. Russell had been persuaded by Senator Gwin of California to start the Pony Express. He had made an arrangement with the railways between New York and St. Joseph to run a fast train; the Hannibal and St. Joseph Railroad used a special engine, and the boat
