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It has to do with the design of the bolts. The reason that head of the bolt is oval in shape. The head of a bolt fit flush into the bar and set in opposing sets is so that a piece of dragging equipment will not shear off all the bolts in a joint but rather the just the nuts one side. As a result if the hole is not oval on one side there would be no way to tighten or loose the bolts in a joint.

Second Answer: They would be oval shapes so when contraction or expansion happens they wont snap.

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14y ago
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15y ago

This is because this allows the rail to expand in hot weather and contract in cold weather.

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15y ago

Because is if they wern't in oval holes, the expansion would make whatever the bolts were holding buckle

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Q: Why are the bolts that hold steel rails together in oval holes?
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