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  2. Stair lift - Wikipedia

    en.wikipedia.org/wiki/Stair_lift

    For sufficiently wide stairs, a rail is mounted to the treads of the stairs. A chair or lifting platform is attached to the rail. A person gets onto the chair or platform and is lifted up or down the stairs by the chair which moves along the rail. Stair lifts are known variously as stairlifts, stair-lifts, chair lifts, stair gliders and by ...

  3. Stairs - Wikipedia

    en.wikipedia.org/wiki/Stairs

    Stairs can be a hazardous obstacle for some, so some people choose to live in residences without stairs so that they are protected from injury. [33] Stairs are not suitable for wheelchairs and other vehicles. A stairlift is a mechanical device for lifting wheelchairs up and down stairs. For sufficiently wide stairs, a rail is mounted to the ...

  4. 4-8-4 - Wikipedia

    en.wikipedia.org/wiki/4-8-4

    Union Pacific 844, the only steam locomotive never retired by a North American Class I railroad. The 4-8-4 wheel arrangement was a progression from the 4-8-2 Mountain type and, like the 2-8-4 Berkshire and 4-6-4 Hudson types, an example of the "Super Power" concept in steam locomotive design that made use of the larger firebox that could be supported by a four-wheel trailing truck, which ...

  5. Penrose stairs - Wikipedia

    en.wikipedia.org/wiki/Penrose_stairs

    In the real world, the hero should always be in front of the villain throughout this chase. However, in the case of the Penrose stairs the hero descends another flight of stairs to catch up to the antagonist and catch him unaware. [14] The cover of the 2011 album Angles by American rock band The Strokes depicts a complex set of Penrose stairs.