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Ballast is a material used to support the ties and rails, and keep them in place. It is also a key part of drainage along railway lines to ensure the integrity of the tracks during rain and other wet weather. Ballast is often a crushed stone. Stones need to be irregularly shaped, in order to increase friction that holds the tracks in place. [3]
A ballast regulator at work in Spain. A ballast regulator (also known as a ballast spreader or ballast sweeper) is a piece of railway maintenance equipment used to shape and distribute the gravel track ballast that supports the ties in rail tracks. They are often used in conjunction with ballast tampers when maintaining track.
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.
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]
Corrosion in ballast tanks on marine vessels can be an issue if good design is not undertaken. [86] Other examples include simple design such as material thickness. In a known corrosion situation the material can just be made thicker so it will take much longer to corrode. [87] Corrosion at joint - bad design
Predictions are good to make, but you can’t live your life by them.” This article originally appeared on Indianapolis Star: Why Arie Luyendyk's DQ 1996 pole day run kept record intact for 28 years
Combined with water in the ballast, these fines stick together, making the ballast like a lump of concrete. This hinders both track drainage and the flexibility of the ballast to constrain the track as it moves under traffic. [2] Ballast cleaning removes this worn ballast, screens it and replaces the "dirty" worn ballast with fresh ballast.
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