The Granfey railway viaduct connects Bern with Fribourg and is with ober 340m length and over 80m heights one of the biggest bridges in Switzerland. The first version was a grid-construction from 1862. But the electrification of the railway line Bern - Lausanne changed the weight of the trains, so it was necessary to change the construction to something more stable. 1927 - after two years of construction - was the new viaduct completed. The metal grid was gone, the new appearance was way more neoclassical with big arches (over 40m wide) and smaller arcades on top, stabilizing the rails on top.
And then, 1962, they built the Schiffenen-Dam which created the lake Schiffenen beneath the bridge.
When a train passes, the entire construction starts to vibrate and the loud noise of the passing train fills the passage, coming from everywhere... Kinda scary sometimes.