The viaduct of Souzain was built in 1904 by Louis Auguste Harel of Noë for the Railroads of Coast-of-North. It is located between the towns of Saint-Brieuc and Plérin. It had a form in " Y". Side of Plérin, a branch left towards " Under the tour" (line of Saint-Brieuc to the headlight). The second branch was useful for the line Saint-Brieuc - Plouha. It was classified with the inventory of the Historic buildings on December 21st 1993.

Its main features are:

• overall length: 280 m
• height: 30 m

In the beginning, it was rail and road. With the closing of the network of the Railroads of Coast-of-North, it was used in bridge " route" until its destruction (on June 27th 1995).

Internal bonds

• List of bridges of Coast-in Armor
• Railroads of Coast-of-North

External bonds

• Association for the safeguard of works of art of Harel of Noë
• Association of the Railroads of Coast-of-North
• Viaduct of Souzain on Structurae