SNCF INFRA : The bridge over the river Lay (district of Vendée),on the line Bordeaux Nantes, is seen on the 31st July 2010. The speed has just been limited to 40 km/h. Later in 2014, a speed limit to 60 km/h will be added further heading Le Champ St Père. 
The nest is occupied by a couple of storks.

Photo Patrick Meunier www.pixyrail.com