I found out that there are some troubles with the Dutch Station platforms made by Oppie. I already tried to contact him about it, but I'm affraid he left the forums again, so until he shows up this solution might help you use the stations.
First off...His station pack can be found here: http://www.tt-forums.net/viewtopic.php?f=40&t=62227 and I want to thank Oppie for creating this great station pack. Most Dutch game-players will be very satisfied with this pack.
The problem is that you can't create different station parts in a normal way. It's very difficult to make a station with parts on the places that you want, because when you place the a few different parts, they will all be the same or shown in different ways...But hey, sometimes a picture can tell more than a thousend words. If you follow the steps shown in the pictures below, you will be able to create nice stations with this great pack that Oppie made for us:
Picture 1:
As you can see in the first picture I would like to use different parts of the pack all in one station, I have left a few open spaces to show the different parts.
Picture 2:
However, when I fill up those open spaces with parts the station changes into a station that I don't want.
Picture 3:
Today, I found (accidently) the solution for my problem when I build a bridge above the platform. You see when you build a bridge above the platform, the game can show different parts of the station and then you can play around with the different parts.
Picture 4:
However, if I try to build a second lane next to it (wich the bridge removed on the first lane) and I build a new station-part, the entire station changes again.
Picture 5:
So whenever you build a lane next to it, keep the bridge over the first lane and build a second bridge over the second lane as well. Then you can again play around with the different station-parts and build your own type of station.
Picture 6:
Now remember that you must keep the bridges over the stations until you are absolutly sure that your newly designed station is ready and that you don't want to change anything anymore.
When you are done remove the bridges and higher grounds and you can use the station for your trains.
The station without the bridges, and now with overhead wires and two trains.
B.t.w. remind this again...Keep the bridges in place until you are ready with the entire station. Any part of the station that has the same name, will change the station back to the situation showed in the second and fourth picture.
This will work as well if you don't use the bridge shown in the pictures. It will also work with the station concourse build over it. Although it's a little more difficult to see, it can work in the end. Just practice and play around with this solution, and you can create the most beautifull Dutch stations and you can create them in a way as you see fit. Here's one last example-screenshot with a concourse, dummy platforms, extra side buildings and (harbour)building from the Digidampfman pack.
The first six parts, and the last six parts are build in the same way as shown in the 6 picture tutorial. The parts under the concourse are placed with one concourse part every time that I build an extra trackpiece to make the station longer (of course I can make my stations longer with the Long Station Patch, I realy can't play a game without it

Enjoy, and have fun in creating your own stations !
Regards,
Erik