FACTOID # 168: There are 11 countries where the average woman has more than six children. Ten of them are in Africa.
 
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Encyclopedia > Track ballast
Concrete sleepers laid on Ballast
Concrete sleepers laid on Ballast

Track ballast, consisting of gravel, cinders or other aggregate, forms the trackbed upon which railway sleepers are laid. It is used to facilitate drainage of water, and to create even running surface. Download high resolution version (2272x1704, 822 KB) Wikipedia does not have an article with this exact name. ... Download high resolution version (2272x1704, 822 KB) Wikipedia does not have an article with this exact name. ... Gravel being unloaded from a barge Gravel is rock that is of a certain size range. ... Cinders are nut-sized pieces of red or black rock fragments resulting from the ejection of liquid lava that are uncemented vitric, vesicular, pyroclastic material, more than 2. ... Aggregate is the component of a composite material used to resist compressive stress. ... A railroad tie or sleeper is an oblong object used as a base for railroad tracks. ... Drainage is the natural or artificial removal of surface and sub-surface water from a given area. ...


  Results from FactBites:
 
Tracklaying (1491 words)
The track is usually sold in 1 yard (914mm) lengths and may be laid curved or straight or any combination you wish.
Flexible track is more work to set up, but the extra time and effort rewards you with less joins, more realistic looking curves and often a cash saving as flex track is usually cheaper than the equivalent length of set track.
If standard track is put on the floor, especially on carpet, then no matter how clean you think it is, trust me, grit, hairs, fluff, cotton and things you never knew were on the floor will get inside and ruin the mechanism.
  More results at FactBites »


 

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