Machine Design
The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that

It is more stretched than the outer side during the manufacturing process
It has a lower curvature than the outer side
It is subjected to a higher stress than the outer side
It is subjected to a higher cyclic loading than the outer side

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Machine Design
When a belt drive is transmitting maximum power,

Driving tension on slack side is equal to centrifugal tension
Effective tension is equal to centrifugal tension
Effective tension is half of centrifugal tension
Driving tension on tight side is twice the centrifugal tension

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