With GCA82, servo's can be controlled with Motorola devices like Maerklin Controls and Intellibox.
Supply can be achieved from rails or separate.
Adress selector on board standard compatible with Maeklin K83.
This board is a D.I.Y. project. No boards available.
The basic, assembler and hex files can be donloaded here:
Basic program is written with Pic Simulator IDE http://www.oshonsoft.com