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  2. Ballast tractor - Wikipedia

    en.wikipedia.org/wiki/Ballast_tractor

    The ballast box is a metal box installed on the rear chassis of the tractor instead of the fifth wheel coupling. Earlier heavy haulers unmounted the fifth wheel and used merely a piece or two of heavy rocks , stones or concrete blocks which weighted enough to avoid wheel spin, [ 4 ] later builders and heavy haulers developed metal boxes of ...

  3. Three-point locking - Wikipedia

    en.wikipedia.org/wiki/Three-point_locking

    Three-point locking, or a multipoint lock, is a locking system installed in cabinet or locker doors to enable more secure locking. Whereas in single-point locking , the door on a cabinet locks only at the point where the key is turned, halfway up the edge of the door, three-point locking enables the top and bottom of the door to be ...

  4. Corrosion in ballast tanks - Wikipedia

    en.wikipedia.org/wiki/Corrosion_in_ballast_tanks

    Each region behaves distinctively, according to it electrochemical loading. The differences can especially be seen in empty ballast tanks. The upper sections usually corrode but the lower sections will blister. A ballast tank has three distinct sections: 1) upper, 2) mid or "boottop" area and, 3) the "double bottom" or lower wing sections.

  5. Tamping machine - Wikipedia

    en.wikipedia.org/wiki/Tamping_machine

    Jackson 6700 switch tamping machine A Plasser & Theurer 09-16 CSM Tamper / Liner A MATISA tamper at Keighley in February 2017 Customer VolkerRail. A tamping machine or ballast tamper, informally simply a tamper, is a self-propelled, rail-mounted machine used to pack (or tamp) the track ballast under railway tracks to make the tracks and roadbed more durable and level.

  6. Ballast - Wikipedia

    en.wikipedia.org/wiki/Ballast

    Cross section of a vessel with a single ballast tank at the bottom. Ballast is dense material used as a weight to provide stability to a vehicle or structure. Ballast, other than cargo, may be placed in a vehicle, often a ship or the gondola of a balloon or airship, to provide stability.

  7. Track ballast - Wikipedia

    en.wikipedia.org/wiki/Track_ballast

    The appropriate thickness of a layer of track ballast depends on the size and spacing of the ties, the amount of traffic on the line, and various other factors. [1] Track ballast should never be laid down less than 150 mm (6 inches) thick, [5] and high-speed railway lines may require ballast up to 0.5 metres (20 inches) thick. [6]

  8. Ship ballast - Wikipedia

    en.wikipedia.org/wiki/Ship_ballast

    Pumps can also be used to empty the leeward ballast tank and fill the windward tank as the boat tacks, and the quantity of ballast can be varied to keep the boat at the optimum angle of heel. A disadvantage of water ballast is that water is not very dense and therefore the tanks required take up more space than other forms of ballast.

  9. Electrical ballast - Wikipedia

    en.wikipedia.org/wiki/Electrical_ballast

    [1] [3] To prevent this, fluorescent tubes are connected to the power line through a ballast. The ballast adds positive impedance (AC resistance) to the circuit to counteract the negative resistance of the tube, limiting the current. [1] Several American magnetic ballasts for fluorescent lamps. The top is a rapid start series autoregulator ...

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