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What should be the permissible variation in the overall height of rails ?
1. +1.0 mm to -0.5 mm
2. ± 0.5 mm
3. +0.8 mm to -0.4 mm
4. +2.0 mm to -10 mm

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Correct Answer - Option 3 : +0.8 mm to -0.4 mm

Concept:

The rail specifications (IRS-T-12-96) for flat-bottom symmetrical rails, the tolerances allowed in the various parameters of a rail section are given below:

Parameter

Permissible Variation

Overall height

+0.8 mm to -0.4 mm

Width of head

± 0.5 mm

Width of Flange

± 1 mm ( If section < 60 Kg/m

+ 1.2 mm and -1 mm ( If Sections ≥  60 Kg/m)

Thickness of Web

+ 1 mm to -0.5 mm

Vertical Flange

± 1.2 mm

Length of Rails

+2 mm to -10 mm

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