ballast main

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• ballast — [ balast ] n. m. • 1375 « lest »; mot scand., par le moy. bas all. 1 ♦ (1840; empr. à l angl.) Pierres concassées que l on tasse sous les traverses d une voie ferrée. Carrière à ballast (ou BALLASTIÈRE n. f. ). 2 ♦ (1943) Mar. Réservoir de… …   Encyclopédie Universelle

• Ballast tank — A ballast tank is a compartment within a boat or ship, that holds water. A vessel may have a single ballast tank near its center or multiple ballast tanks typically on either side. A large vessel typically will have several ballast tanks… …   Wikipedia

• Ballast tamper — A ballast tamper or tamping machine is a machine used to pack (or tamp) the track ballast under railway tracks to make the tracks more durable. Prior to the introduction of mechanical tampers, this task was done by manual labour with the help of… …   Wikipedia

• ballast-heaver — ballˈast heaver noun • • • Main Entry: ↑ballast …   Useful english dictionary

• in ballast — phrasal of a ship : with only ballast as a load * * * in ballast Carrying ballast only • • • Main Entry: ↑ballast * * * (of a ship) laden only with ballast …   Useful english dictionary

• water ballast — noun : water in specially constructed compartments (as of a ship or balloon) to serve as ballast * * * water ballast noun 1. Water carried by a ship to balance or redress the change of draught due to consumption of fuel or provisions or discharge …   Useful english dictionary

• History of the Duwamish tribe — Main article: Duwamish tribe The region now known as Seattle has been inhabited since the end of the last glacial period (c. 8,000 BCE.: 10,000 years ago). Archaeological excavations at West Point in Discovery Park, Magnolia confirm that the… …   Wikipedia

• MBT — Main Battle Tank (Governmental » Military) ** Mobile TeleSystems OJSC (Business » NYSE Symbols) * Mahindra British Telecom (Business » Firms) * Maximum Brake Torque (Governmental » Transportation) * Main Ballast Tank (Governmental »… …   Abbreviations dictionary

• Permanent way — The permanent way means the physical elements of the railway line itself: generally the pairs of rails typically laid on sleepers embedded in ballast, intended to carry the ordinary trains of a railway. This page describes British practice and… …   Wikipedia

• railroad — /rayl rohd /, n. 1. a permanent road laid with rails, commonly in one or more pairs of continuous lines forming a track or tracks, on which locomotives and cars are run for the transportation of passengers, freight, and mail. 2. an entire system… …   Universalium

• Track (rail transport) — Permanent way redirects here. For other uses, see Permanent way (disambiguation). Twin rail tracks in a wooded area …   Wikipedia