The dry pipe carries the steam from the dome forward to the superheater, an improvement that came into wide use around 1910. (More modern locomotives had their throttles located in the smokebox.) The steam rises to the top of the boiler and is collected in the dome, where the throttle regulating the flow of steam to the cylinders is typically located. Heat from the gases in the flues brings the water to a boil, making steam. The best way to envision how the inside of a cylindrical boiler looks is to imagine a bundle of drinking straws in a glass (only the glass would be resting on its side, not upright). The gases move from the firebox forward through an array of pipes called flues, or tubes, in the main part of the boiler, which is filled with water. At the end of the run, the ashes are dumped from the ashpan hopper. On a coal-burning locomotive, the build-up of ash is controlled by shaking the grates so the ashes fall to the ashpan below. Hot gases rise from the firebed to the upper portion of the firebox, or combustion chamber. The production of steam begins with the fire, which rests on grates at the bottom of the firebox. The essential action of any steam engine, stationary or mobile, is that of steam under pressure (200-300 PSI for most locomotives) entering a cylinder-piston assembly and pushing against the piston as it expands in an effort to reach normal atmospheric pressure. There are two basic areas of activity on a steam locomotive: the boiler where steam is made, and the engine (cylinders, rods, and driving wheels) where steam is used. In fact, entire books have been devoted to the subject. This mechanical honesty has long captivated onlookers and invited study, but many still wonder just how steam locomotives work. Unlike modern machines, the steam locomotive - which underwent few fundamental changes in 125 years of development - openly displays many of its parts. Non-employees who access these locations without permission will be treated as trespassers.There’s no denying the drama of a powerful locomotive, but how do steam locomotives work? Western Maryland Scenic Railroad‘s 1309, a 2-6-6-2, was photographed during a 2022 Trains Magazine photo charter. This usually means the locomotive will be stored within a rail yard or other Union Pacific property where live rail operations are being conducted. No Public Access: Locations where the public is not allowed to view the Big Boy because of safety or security reasons. Passenger Excursion While listed on the steam schedule, passenger excursion tickets are sold by outside entities - not Union Pacific - and are not available on the day of the excursion. Passenger Excursion: We're sorry, but there will not be opportunities to purchase tickets to ride in 2023. Unless otherwise noted on the schedule, overnight stops are "viewing only." In some cases, the Big Boy will be displayed behind a fence or other perimeter. Viewing Only: Locations where fans can safely view the Big Boy. These are the best times to see the Big Boy. On Display: Admission to display days are free (no tickets required), though parking at surrounding parking facilities may involve a charge. You can also view the route on our interactive Steam Location Tracking map.
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