Monday, December 8, 2014

कैसे बनते हैं रेल का बोझ उठाने वाले प्लास्टिक के रेलवे स्लीपर

प्लास्टिक के घरेलू कूड़े से सम्भव होता है यह करिश्मा 

Courtesy:Knowledge Hindi//YouTube 
Published on Nov 7, 2014 
How To Make Plastic Railway Sleepers - Hindi
Factory Made - How To Make Plastic Railway Sleepers - Hindi

A railroad tie/railway tie/crosstie (North America), or railway sleeper (Europe, Australia & Asia) is a rectangular support for the rails in railroad tracks. Generally laid perpendicular to the rails, ties transfer loads to the track ballast and subgrade, hold the rails upright, and keep them spaced to the correct gauge.

Railroad ties were traditionally made of wood, but pre-stressed concrete is now widely used, especially in Europe and Asia. Steel ties are common on secondary lines in the UK; plastic composite ties are also employed, although far less than wood or concrete. As of January 2008, the approximate market share in North America for traditional and wood ties was 91.5%, the remainder being concrete, steel, azobé (red ironwood) and plastic composite.

Coarse aggregate is the standard material for track ballast, which provides drainage and resilience. On lines with lower speeds and axle-weights, sand, gravel, and even coal ash from the fires of steam locomotives have been used.

Up to 3000 ties are used per mile of railroad track in the US, 2640 per mile (30 per 60 ft rail) on main lines in the UK. Rails in the US may be fastened to the tie by a railroad spike; iron/steel baseplates screwed to the tie and secured to the rail by a proprietary fastening system such as a Vossloh or Pandrol are commonly used in Europe.

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