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2. Handrail - Wikipedia

   en.wikipedia.org/wiki/Handrail

   Codes also generally require that there be a 1 + 1 ⁄ 2 inches (38 mm) clearance between the underside of the handrail and any obstruction—including the horizontal bracket arm. There is an allowance however for variations in the handrail size—for every 1 ⁄ 2 inch (13 mm) of additional perimeter dimension over 4 inches (102 mm), 1 ⁄ 8 ...

3. Handcar - Wikipedia

   en.wikipedia.org/wiki/Handcar

   3-wheeled handcar or velocipede on a railroad track Preserved railroad velocipede on exhibit at the Toronto Railway Historical Association. A handcar (also known as a pump trolley, pump car, rail push trolley, push-trolley, jigger, Kalamazoo, [1] velocipede, or draisine) is a railroad car powered by its passengers, or by people pushing the car from behind.

4. Track gauge in the United States - Wikipedia

   en.wikipedia.org/wiki/Track_gauge_in_the_United...

   In the early days of rail transport in the United States, railroads tended to be built out of coastal cities into the rural interior and hinterland and systems did not connect. Each railroad was free to choose its own gauge, although the availability of British-built locomotives encouraged some railroads to be built to standard gauge.

5. Guard rail - Wikipedia

   en.wikipedia.org/wiki/Guard_rail

   Staircase railings in the Degré du roi, part of the Petit appartement du roi, in the Palace of Versailles, Versailles, France. Guard rails, guardrails, railings or protective guarding, [1] in general, are a boundary feature and may be a means to prevent or deter access to dangerous or off-limits areas while allowing light and visibility in a greater way than a fence.

6. Dovetail rail - Wikipedia

   en.wikipedia.org/wiki/Dovetail_rail

   Colloquially, the term dovetail rail usually refer to any straight mounting bracket with an inverted trapezoid cross-section (though the hexagonal-profiled Weaver rail and Picatinny rail are also derivative dovetail designs) running parallel to the bore for mounting a scope or diopter sight to a rifle. These are sometimes also called "tip-off ...

7. San Diego Trolley - Wikipedia

   en.wikipedia.org/wiki/San_Diego_Trolley

   The first phase of the project cost $86 million, which included the purchase of the SD&AE, 14 light rail vehicles, construction of a single-tracked electrified light rail line along the 14.2-mile (22.9 km) SD&AE Main Line and construction of a 1.7-mile (2.7 km) section of new street running tracks in downtown San Diego. [8]