SNCF (Société National des Chemins de Fer) is the French public company leading the train public transport and freight business. They decided to use WPF to refresh the software of their ticket machines. Why Microsoft technologies ?
1 - to refresh the interfaces in a more attractive way (using WPF)
2 - to reduce the cost and develoment time (using .NET)
if you are speaking French, you can read more about the SNCF testimony.