Correct Answer - Option 2 : 3 mm tight to 15 mm slack
Concept:
Track Tolerances:
The safety and comfort of travel depend primarily on track geometry and the standard at which it is maintained. In practice, it is not possible to obtain a flawless and perfect track; the parameters governing track geometry always show certain variations due to various reasons. Track tolerances may be defined as the limits of the variability of various parameters pertaining to track geometry.
Tolerances are generally laid down for the following track parameters:
- Gauge variation
- Unevenness
- Cross-level difference
- Twist
Meter Gauge
|
Tolerance
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On straight
|
3 to 6 mm
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On a curve with a radius of 290m or more
|
3 to 15 mm
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On curve radius less than 290m
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Up to 20 mm
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