CROSSING ASSEMBLY
Crossing
A Device introduced at the location where two gauge faces have to cross each other to permit wheels flanges of the rolling stock moving from one track to the other track with maximum safety andn minimum disturbances.
Type of crossings
Crossings are generally of two types:
(a) Acute crossing, acute angled or vee crossing in which the intersection of two gauge lines form an acute angle (below 90 degree)
(b) Obtuse crossings, in which the intersection of two gauge lines form an obtuse angle (above 90 degree) see below :
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| Type of crossings |
Number of a Crossing
The number of a crossing is defined as the ratio of the spread at the leg of the crossing to the length of crossing measured from its theoretical nose. In the Indian Railways, this number is taken as the cotangent of the angle formed by the crossing.
The smooth passage of the rolling stock from one track to another depends among other factors on the angle of the crossing, which is kept as small as possible for high speed traffic on the running lines. In the Indian Railways, four angels of crossing namely in 1 in 8½, 1 in 12, 1 in 16 and 1 in 20 are generally used.
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