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  2. Garage door - Wikipedia

    en.wikipedia.org/wiki/Garage_door

    A garage door with a broken spring or the wrong strength can fall. Because the effective mass of the door increases as the garage door sections transfer from the horizontal to vertical door tracks, a falling garage door accelerates rapidly. A free-falling garage door can cause severe injury or death. The sections and rollers on garage doors ...

  3. Clearance (civil engineering) - Wikipedia

    en.wikipedia.org/wiki/Clearance_(civil_engineering)

    In civil engineering, clearance refers to the difference between the loading gauge and the structure gauge in the case of railroad cars or trams, or the difference between the size of any vehicle and the width/height of doors, the width/height of an overpass or the diameter of a tunnel as well as the air draft under a bridge, the width of a lock or diameter of a tunnel in the case of watercraft.

  4. Loading gauge - Wikipedia

    en.wikipedia.org/wiki/Loading_gauge

    The main platform is defined to have a height of 1,100 mm (43.3 in) at a distance of 1,920 mm (75.6 in) from the center of the track to allow for trains with profile T. Low platforms at a height of 200 mm (7.9 in) may be placed at 1,745 mm (68.7 in) from the center of the track.

  5. American Railway Engineering and Maintenance-of-Way ...

    en.wikipedia.org/wiki/American_Railway...

    AREMA is headquartered in Lanham, Maryland, a suburb of Washington, D.C. As stated in their mission statement, AREMA promotes "The development and advancement of both technical and practical knowledge and recommended practices pertaining to the design, construction and maintenance of railway infrastructure."

  6. Fluid bearing - Wikipedia

    en.wikipedia.org/wiki/Fluid_bearing

    Fluid bearings are bearings in which the load is supported by a thin layer of rapidly moving pressurized liquid or gas between the bearing surfaces. [1] Since there is no contact between the moving parts, there is no sliding friction, allowing fluid bearings to have lower friction, wear and vibration than many other types of bearings.

  7. Tell-tale (bridges) - Wikipedia

    en.wikipedia.org/wiki/Tell-tale_(bridges)

    A tell-tale warning of a low clearance over a road. A tell-tale, also known as a bridge warning, is a series of ropes suspended over railway tracks to give warning to the engineer, and more importantly the brakeman who may be scampering across the tops of the cars, that the train is approaching a low-clearance obstacle, such as a tunnel or a bridge.

  8. Plain bearing - Wikipedia

    en.wikipedia.org/wiki/Plain_bearing

    The last form is a plastic bearing, which has the lubricant molded into the bearing. The lubricant is released as the bearing is run in. [38] There are three main types of lubrication: full-film condition, boundary condition, and dry condition. Full-film conditions are when the bearing's load is carried solely by a film of fluid lubricant and ...

  9. Sommerfeld number - Wikipedia

    en.wikipedia.org/wiki/Sommerfeld_number

    Nikolai Pavlovich Petrov's method of lubrication analysis, which assumes a concentric shaft and bearing, was the first to explain the phenomenon of bearing friction.This method, which ultimately produces the equation known as Petrov's law (or Petroff's law), is useful because it defines groups of relevant dimensionless parameters, and predicts a fairly accurate coefficient of friction, even ...

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