Rautenhaus Digital is the company Modellbahntechnik Gerhard Rautenhaus** in Syke, Germany.
A complete range products to get a Selectrix* system is available here.

In the Netherlands are many friends of the Z gauge modelrailways.
spoor-z is the specialist with a wide range Z product choice.
Here are VELMO decoders available also.

Passmann Modellbahnzubehör is expert for waggon ilumination and locomotive decoders. The distribution of the VELMO Selectrix decoders and adapterboards in Germany is possible with the friendly permission of Oliver Passmann.

Great, the locos and wagons of SMZ. They created a lot of new variants by reprinting the locos and wagons.
The Highlight of all is their own developed ÖBB1044 and ÖBB2143!.

The all including homepage for Z-gauge is Jens Wimmels’ ZettZeit. Here you can find nearly everybody and everything around the Z-gauge, own products, many ideas and so much more...

The searchengine for everything has to do with trains is Bahnsuche.

Allways a great experience:
The meetings of the menbers of the Märklin Insider Stammtisch, also called  MIST55 near Mainz.

Here you can find many Z-Friends dicussing about everything, many pictures and ideas: Z-Friends-Europe.

And last but not least: Just have a look at my own model railway. That’s where everything started...