For a picture of the interior of a similar train check out pic 29311!
As has been mentioned the two doors in the front open up to link trains. This is illustrated in this pic. This train will be split up halfway, one half going to Den Haag (the Hague) and the other ... (more)
Close-up of the nose, clearly visible are the big doors that can be used to link two (or more) train sets. This is clearly shown on pic 27100.
The "koploper" (frontrunner) trains are used for longer distance in the Netherlands. The driver sits in an elevated position. This makes it possible to link several trainsets together. Up to 3 set... (more)