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2. North American railroad signals - Wikipedia

   en.wikipedia.org/wiki/North_American_railroad...

   New LED signals may either use an unfocused array or act as a drop-in replacement behind a traditional lens. U.S. signal lenses have a standard diameter of 8 + 3 ⁄ 8 inches (210 mm). North American signals use a standard set of colors, defined in October 1905, and which became common to other modes of transportation as shown on page 384 of ...

3. Wigwag (flag signals) - Wikipedia

   en.wikipedia.org/wiki/Wigwag_(flag_signals)

   Each flag had a number of ties or tapes sewn along the hoist edge. These were used to fix the flag to a four-section staff, each section four feet long and fitted with ferrules for joining. [18] The disks were 12 to 18 inches (30 to 46 cm) in diameter and were made of metal or wood frames with canvas surfaces.

4. Guidon (United States) - Wikipedia

   en.wikipedia.org/wiki/Guidon_(United_States)

   As described in Chapter 6 of Army Regulation 840-10, guidons are swallow-tailed marker flags in branch-of-service colors, measuring 20 inches (51 cm) at the hoist by 27 inches (69 cm) at the fly, with the swallow-tail end forked 10 inches (25 cm). [1] [2] Previously guidons were made of wool bunting, and if serviceable these older versions may ...

5. Flagpole - Wikipedia

   en.wikipedia.org/wiki/Flagpole

   The standard vertical flag (German: Hochformatflagge or Knatterflagge; no. 2) is a vertical form of the standard flag. The flag's design may remain unchanged (No. 2a) or it may change, e.g. by altering horizontal stripes to vertical ones (no. 2b). If the flag carries an emblem, it may remain centred or may be shifted slightly upwards. [3] [4]

6. US sees highest population growth in over 2 decades. What's ...

   www.aol.com/us-sees-highest-population-growth...

   The estimates also mark a stark contrast to the record low growth rate of 0.2% in 2021, a time when countries were restricting travel because of COVID-19, the U.S. Census Bureau said.

7. Glossary of rail transport terms - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_rail_transport...

   2. There shall not be a variation of more than one-half inch in the circumference of any given number of wheels of the same nominal diameter, furnished by any one maker, and the same wheel must not vary more than one-sixteenth of an inch in diameter. The body of the wheel must be smooth and free from slag or blow holes.