Hallerbachtal Bridge, Railway bridge in Rhineland-Palatinate, Germany

The Hallerbachtal Bridge is a railway viaduct made of prestressed concrete that spans approximately 1 kilometer across the valley to connect two sections of the Cologne-Frankfurt high-speed rail line. The structure uses concrete piers and tension cables to distribute the weight of passing trains.

Planning for the bridge was underway by late 1995, when its length was already set at 992 metres. Construction began in October 1998 and was completed after 20 months, in September 2000; the superstructure had been finished in May 2000. The bridge was built using a 196-tonne launching girder, and 20 of its 24 piers rest on nine large bored piles each.

Railway enthusiasts treat the stretch around the bridge as a highlight of the line, joking that the rapid sequence of tunnels, bridges and curves at up to 40 per mille gradient is the world's fastest roller coaster. Many advertising photos for the high-speed line were taken from the upper part of the bridge looking south.

The bridge is not open to the public since it serves only rail traffic and sits within an active railway corridor. It can best be viewed from nearby train stations or from vantage points along the surrounding landscape.

The bridge was built with a 196-tonne launching girder, using 17,320 cubic metres of concrete, 2,500 tonnes of reinforcing steel and 430 tonnes of prestressing steel. Twenty of its 24 piers stand on nine large bored piles each, 1.50 metres in diameter; the rest and the abutments are shallow-founded.