CROSS SECTIONAL ELEMENTS OF RAILWAY
CROSS SECTIONAL ELEMENTS OF RAILWAY :
1. Right of Way
The area of land acquired and reserved for construction and development of railway track along its alignment is called right of way or permanent land. The width of the right of way is called permanent land width.
2. Formation
The prepared and finished surface of earthwork
(In embankment or in cutting ) on which a railway track is laid is called the formation of subgrade. Formation serves the following functions.
1. It provides a firm foundation bed to the track.
2. It provides a smooth and graded surface to the track.
3. It provides effective drainage of the track.
3. Formation width
The top width of a railway embankment or bottom width of formation of cutting excluding the side drain is called formation width. The formation width of a railway track depends upon its gauge, number of tracks to be laid and space required between them.
Minimum formation width for B. G track as per the recommendation of Indian railway board:
4. Side Slopes
The slopes gives to the sides of earthwork of a track in cutting or embankment for stability are called side slopes. Side slopes should be such that the earthwork becomes stable ever adverse climatic condition.
It depends upon various factors such as nature of soil, climatic condition method of drainage, and method of protection of side slope from erosion, height of embankment and depth of cutting. Usually, 2:1 side slope for track embankment and 1:1 side slopes for cutting is recommended.
5. Side Drains
The drains provided on either side of railway tracks are known as side drains. Side drains are generally trapezoidal in section with 1.8 m top width and 0.9 m bottom width of a track embankment. In case of track in cutting, the top width of the side drain is usually kept as 1.22 m.
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