railway ballast

См. также в других словарях:

• Ballast — may mean: Objects: * Ballast tanks, a device used on ships and submarines and other submersibles to control buoyancy and stability * Ballast weights, metallic plates used to bring auto racing vehicles up to the minimum mandated weight *… …   Wikipedia

• ballast — ► NOUN 1) a heavy substance carried by a ship or hot air balloon to keep it stable. 2) gravel or coarse stone used to form the base of a railway track or road. 3) a passive component used in an electric circuit to moderate changes in current.… …   English terms dictionary

• 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

• Railway signalling — Not to be confused with Railway signal. A gantry of British semaphore signals seen from the cab of a steam locomotive Railway signalling is a system used to control railway traffic safely, essentially to prevent trains from colliding. Being… …   Wikipedia

• Ballast cleaner — A ballast cleaner is a railway machine that specialises in cleaning the railway track ballast (gravel, blue stone or other aggregate) of impurities. External links [http://www.grandadsez.co.uk/railways/ballast cleaners.html] Technical Information …   Wikipedia

• Railway — Chemin de fer Pour les articles homonymes, voir Chemin de fer (homonymie). Voie ferrée électrifiée …   Wikipédia en Français

• Railway engines (Thomas and Friends) — For the narrow gauge railway engines from Thomas and Friends, see Narrow gauge engines (Thomas and Friends). This article lists the standard gauge Railway Engine characters of the Television Series Thomas and Friends (formerly Thomas the Tank… …   Wikipedia

• Railway signal — Not to be confused with Railway signalling. A signal is a mechanical or electrical device erected beside a railway line to pass information relating to the state of the line ahead to train/engine drivers. The driver interprets the signal s… …   Wikipedia

• Railway brake — A traditional clasp brake: the brake shoe (brown) bears on the surface (tyre) of the wheel (red), and is operated by the levers (grey) on the left …   Wikipedia

• ballast — /ˈbæləst / (say baluhst) noun 1. any heavy material carried by a ship or boat for ensuring proper stability, so as to avoid capsizing and to secure the greatest effectiveness of the propelling power. 2. something heavy, as bags of sand, placed in …  

• ballast — [ baləst] noun 1》 a heavy substance, such as gravel or lead, placed in the bilge of a ship to ensure its stability.     ↘a substance carried in an airship or on a hot air balloon to stabilize it. 2》 gravel or coarse stone used to form the bed of… …   English new terms dictionary