On the 7th September 2005, extra trains ran to Roermond for visitors of the veterans day. 
The picture shows the 9426 + 9401 as (extra) train 28707 (Den Haag Centraal - Roermond).
Delft Zuid, Wednesday 7th September 2005. 

Photo by Rogier Peeters (R.Peeters@student.tudelft.nl)