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About the zig-zag railways in Australia and Peru. The former (in New South Wales) was replaced by a continuous route, while the latter still exists.
The Seikan Tunnel in Japan is several years (over 20?) older than the Channel Tunnel but to cape-gauge initially (not sure whether twin bore for double track). It was then equipped with two external rails for standard gauge but trains are still restricted as regards the smaller structure gauge.
I would consider the whole high speed link from London St Pancras (minus 17 days from today) to the interconnections near Lille in France and thence to Paris, Brussels and Amsterdam as a Railway Wonder.
I would like to mention that I consider all the rail-enthusiasts' enterprises as Railway Wonders, so the field for a special mention is restricted to common carrier operations, as well as industrial operations (e.g. the Rheinbraun coal-railway electrified at 6 kV/50 Hz and 35-t axle-load).
Cheers from Dario
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