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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

   The 66-foot (20.1 m) chain is divided into 100 links, usually marked off into groups of 10 by brass rings or tags which simplify intermediate measurement. Each link is thus 7.92 inches (201 mm) long. A quarter chain, or 25 links, measures 16 feet 6 inches (5.03 m) and thus measures a rod (or pole).

5. Minimum railway curve radius - Wikipedia

   en.wikipedia.org/wiki/Minimum_railway_curve_radius

   This is particularly true of the European buffer and chain couplers, where the buffers extend the length of the rail car body. 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).

6. Double-stack rail transport - Wikipedia

   en.wikipedia.org/wiki/Double-stack_rail_transport

   CSX lists three clearance heights above top of rail for double stack service: [8] Doublestack 1 — 18 ft 2 in (5.54 m) [8] Doublestack 2 — 19 ft 2 in (5.84 m) [8] Doublestack 3 — 20 ft 2 in (6.15 m) [8] Doublestack 4 — 20 ft 3 in (6.17 m) [9] The last 2 clearances offer the most flexibility, allowing two high cube containers to be stacked.

7. Twenty-foot equivalent unit - Wikipedia

   en.wikipedia.org/wiki/Twenty-foot_equivalent_unit

   The twenty-foot equivalent unit (abbreviated TEU or teu) is a general unit of cargo capacity, often used for container ships and container ports. [1] It is based on the volume of a 20-foot-long (6.1 m) intermodal container, a standard-sized metal box that can be easily transferred between different modes of transportation, such as ships, trains, and trucks.