Over the last 150 years on the West Olympic Peninsula, timber transportation changed from oxen and horses hauling logs to machinery, railroads, and trucks. In the early days of logging, oxen were used more than horses because they were easier to purchase and transport, though they were difficult to work with and harder to care for. Horses pulled logs over skid roads, which reduced friction and made hauling easier, and although horse teams cost more to acquire, they were usually easier to work with than oxen. One of the first machines used to haul logs was the Dolbeer Donkey, designed by a ship's captain to resemble a ship's capstan, but design flaws caused its cables to wear out rapidly and required frequent replacement. In the 1920s, the double drum donkey stacked logs before they were hauled away by railroad and trucks, but its steam power demanded huge amounts of water and fuel. Heavily loaded wagons built for road use had no brakes, so their rear wheels were chained together and dragged to slow them, and they often traveled on roads built over old railroad beds. A 1915 Nash Quad Four Wheel Drive Truck was difficult to maneuver in the woods, and with no cab, limited braking power, and insecurely bound logs, a sudden stop could send logs over the driver; its top speed was about 16 miles per hour. Locomotives hauled vast quantities of timber and even moved logging camps to new sites, serving for more than a hundred years as essential but complex equipment that required great expertise to build, operate, and maintain, while trestles stood as remarkable engineering works. In the 1940s, truck reloads such as GM or International models at first carried loads only where rail lines were absent, but after roads were built, trucks became preferred because they were cheaper, safer, and easier to operate. Today, logging trucks on SR 101 carry timber, finished lumber, and cedar products.