2.
Left-side-brake Freight Wagon
2 & 3. Freight Wagons - 1880's. These particular wagons saw hard service in the Imperial Valley. Similar wagons plied the foothills and Sierra mountain roads, including the Virginia Turnpike through the covered bridge. They carried up to 4000 pounds each of a variety of goods, and had a working life of about 4000 miles. They are the forerunners of present-day semi trucks, and provided food and supplies to the northern gold and silver mining communities. |
Left-side-brake freight wagon, during its return to
the barn after being
"conserved." |
Right side of this freight wagon as it is backed into
its new home in the barn. |
The brake tie rod seen in the top picture links to
the long vertical lever seen |
Welded to the under side of the shaft are two more
levers, one for each |
This brake system has another feature common to heavy-duty wagons -- self-energizing brake application. It is apparent in the topmost picture that the driver pushes his brake lever forward to apply the brakes. As the wagon slows, the driver's body tends to keep moving forward relative to the wagon. The driver resists this motion by pushing harder on the brakes. This is called self-energizing, because applying the brakes tends to make the driver apply the brakes harder. The ratchet teeth which the brake lever passes near the driver's seat are cut so the driver can push the lever sideways to keep the lever in position after the brakes are applied -- the teeth allow motion to apply the brakes but stop motion in the opposite direction. |