Question 1169290
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Never saw a railway bridge in the shape of a parabola.


Had such a bridge be ever exist, the design and the construction engineers would lose their licenses next day,


and the bridge would be destroyed.



Or preserved as a monument of a human stupidity . . . with forbiddance to move across it . . . 



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In connection with this post, I re-call the old anecdotic story, that was popular among mature construction engineers long time ago.


<pre>
    At the meeting of construction engineers, they are going to discuss on how to construct one particular bridge.

    A chief engineer, who conducts the meeting, proposes to the members to out speak their ideas.

    One person of the staff takes a word and says: "Hmmm . . . , I propose to construct a bridge <U>across the river</U>".
</pre>

A silence during next &nbsp;7 &nbsp;seconds - - - then a curtain . . . 



The same &nbsp;(the similar) &nbsp;anecdotic story does exist about construction engineers that are going to build a dam . . . across a river . . .