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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 inches (0.25 mm). Handrails are located at a height between 34 and 38 inches (864 and 965 mm).
Handrail diameter. The size has to be comfortable for grasping and is typically between 1.25 and 2.675 inches (31.8 and 67.9 mm). Maximum space between the balusters of the handrail. This is typically 4 inches (102 mm). Openings (if they exist) between the bottom rail and treads are typically no bigger than 6 inches (152 mm).
The balustrade is composed of handrails, balustrade panels, and skirt panels. [28] The handrail provides a handhold for passengers while they are riding the escalator. The handrail is pulled along its own track by a chain that is connected to the main drive gear by a series of pulleys, keeping it at the same speed as the steps.
platform gap modifications or bridge plates to reduce or eliminate the gap between trains and platforms where it is greater than 2 inches (5.1 cm) vertically or 4 inches (10 cm) horizontally [3] [5]: F.3 [6] telephones at an accessible height with volume control, and text telephones (TTYs) [3] [5]: F.3
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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.