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  2. Stairs - Wikipedia

    en.wikipedia.org/wiki/Stairs

    The alternating stairs (3) requires one unit of space per step: the same as the half-width stairs (2), and half as much as the full-width stairs (1). Thus, the horizontal distance between steps is in this case reduced by a factor of two, reducing the size of each step.

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  4. Handrail - Wikipedia

    en.wikipedia.org/wiki/Handrail

    This required depth shall continue for at least 3 ⁄ 8 inch (10 mm) to a level that is not less than 1 + 3 ⁄ 4 inches (45 mm) below the tallest portion of the profile. The minimum width of the handrail above the recess shall be 1 + 1 ⁄ 4 inches (32 mm) to a maximum of 2 + 3 ⁄ 4 inches (70 mm). Edges shall have a minimum radius of 0.01 ...

  5. Track geometry - Wikipedia

    en.wikipedia.org/wiki/Track_geometry

    The measurement of crosslevel between two rails. Crosslevel (or 'cross level') is the measurement of the difference in elevation (height) between the top surface of the two rails at any point of railroad track. The two points (each at the head of each rail) are measured at by the right angles to the reference rail. Since the rail can slightly ...

  6. Minimum railway curve radius - Wikipedia

    en.wikipedia.org/wiki/Minimum_railway_curve_radius

    90-foot (27.43 m) radii on the elevated 4 ft 8 + 1 ⁄ 2 in (1,435 mm) standard gauge Chicago 'L'. There is no room for longer radii at this cross junction in the northwest corner of the Loop . The minimum railway curve radius is the shortest allowable design radius for the centerline of railway tracks under a particular set of conditions.

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