the common rules declare this to nonsense, physically impossible icon (<b>tunnel</b> track flying <b>over</b> a bridge). It may be, that other uses are not nonsense.<br><i>This stituation <b>does</b> exist in Paris, where there are bridges in large underground caverns.</i>
<a href="//commons.wikimedia.org/wiki/User:T0118163" title="User:T0118163">T0118163</a>
2010-11-06
<span class="int-own-work" lang="en">Own work</span>