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2. Chain (unit) - Wikipedia

   en.wikipedia.org/wiki/Chain_(unit)

   One link is a hundredth part of a chain, which is 7.92 inches (20.1168 cm). [7] The surveyor's chain first appears in an illustration in a Dutch map of 1607, [8] and in an English book for surveyors of 1610. [9] In 1593 the English mile was redefined by a statute of Queen Elizabeth I as 5,280 feet, to tie in with agricultural practice.

3. Link (unit) - Wikipedia

   en.wikipedia.org/wiki/Link_(unit)

   A Gunter's chain showing the individual links. The link (usually abbreviated as "l.", "li." or "lnk."), sometimes called a Gunter’s link, is a unit of length formerly used in many English-speaking countries. In US customary units modern definition, the link is exactly 66 ⁄ 100 of a US survey foot, [1] or exactly 7.92 inches or 20.1168 cm.

4. Gunter's chain - Wikipedia

   en.wikipedia.org/wiki/Gunter's_chain

   Although link chains were later superseded by the steel ribbon tape (a form of tape measure), its legacy was a new statutory unit of length called the chain, equal to 22 yards (66 feet) of 100 links. [8] This unit still exists as a location identifier on British railways, as well as all across America in what is called the public land survey ...

5. Minimum railway curve radius - Wikipedia

   en.wikipedia.org/wiki/Minimum_railway_curve_radius

   For a line with a maximum speed of 60 km/h (37 mph), buffer-and-chain couplers increase the minimum radius to around 150 m (164 yd; 492 ft). As narrow-gauge railways , tramways , and rapid transit systems normally do not interchange with mainline railways, instances of these types of railway in Europe often use bufferless central couplers and ...

6. List of countries by rail transport network size - Wikipedia

   en.wikipedia.org/wiki/List_of_countries_by_rail...

   Had passenger and freight lines, see Rail transport in Jordan: 400 Kiribati: Had industrial lines 296 Lebanon: Had from 1890 until 1970 (future projects to build a railway from Tyr to Tripoli) 422 Libya: 1912 to 1965 (peak length of 399 km [15]); (network under construction in 2008–2011, but works stopped, see Libyan Railways) 434 Malta

7. Buffers and chain coupler - Wikipedia

   en.wikipedia.org/wiki/Buffers_and_chain_coupler

   Narrow gauge flat wagons, 750 mm (2 ft 5 + 1 ⁄ 2 in).Note the single buffer with a hook on the right side and a chain on the other. On some narrow-gauge lines in Europe, and on the Paris Metro, a simplified version of the loose-coupler is used, consisting of a single central buffer with a chain underneath.

8. Rail profile - Wikipedia

   en.wikipedia.org/wiki/Rail_profile

   The rail profile is the cross sectional shape of a railway rail, perpendicular to its length. Early rails were made of wood, cast iron or wrought iron. All modern rails are hot rolled steel with a cross section approximate to an I-beam, but asymmetric about a horizontal axis (however see grooved rail below). The head is profiled to resist wear ...

9. 5 ft 6 in gauge railway - Wikipedia

   en.wikipedia.org/wiki/5_ft_6_in_gauge_railway

   The use of 1,676 mm (5 ft 6 in) broad gauge rails was one of many unconventional design elements included in its design which, in addition to its unusual gauge, also used flat-edge rail, rather than typical rail that angles slightly inward [5] (although the shape of BART wheels and rail has been modified since then [6]). This has complicated ...