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2. 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."

3. Railway platform height - Wikipedia

   en.wikipedia.org/wiki/Railway_platform_height

   The electric DART fleet has carriage floors at 1,067 mm (42.0 in) above top of rail creating a step of 152 mm (6.0 in) , while the diesel fleet is typically one step (150 to 200 mm or 5.9 to 7.9 in) higher than the platform. On Dublin's Luas tram system, platforms are approximately 280 mm (11 in) above rail. Tram floors are at the same height ...

4. Rack unit - Wikipedia

   en.wikipedia.org/wiki/Rack_unit

   Rack with sample component sizes including an A/V half-rack unit. A rack unit (abbreviated U or RU) is a unit of measure defined as 1 + 3 ⁄ 4 inches (44.45 mm). [1] [2] It is most frequently used as a measurement of the overall height of 19-inch and 23-inch rack frames, as well as the height of equipment that mounts in these frames, whereby the height of the frame or equipment is expressed ...

5. Rack rail - Wikipedia

   en.wikipedia.org/wiki/Rack_rail

   The height of rack rail is determined by the number of rack units required for mounting the equipment. The design of racks and rack rails is specified in ECIA - EIA/ECA-310. Each rack unit (U) is equivalent to 1 + 3 ⁄ 4 in (44 mm). Most rack rail is in sizes from 2 units high (3 + 1 ⁄ 2 in or 89 mm) to 54 units high (78 + 3 ⁄ 4 in or ...

6. Grab bar - Wikipedia

   en.wikipedia.org/wiki/Grab_bar

   ADA-style grab bars and their mounting devices should withstand more than 250 pounds (1112 N) of force. In public toilet stalls, side grab bars must be a minimum of 42 inches long and mounted 12 inches from the rear wall, and rear grab bars must be a minimum of 36 inches long and mounted a maximum of 6 inches from the side wall.

7. Stairs - Wikipedia

   en.wikipedia.org/wiki/Stairs

   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 treads of the stairs, or attached to the wall. A chair is attached to the rail and the person on the chair is lifted as the chair moves along the rail.