Digital

Brauns Electronics - decoders
Dave Hen - EDITS up close and personal
Digital Train - cheap decoders
Digitrax - DCC systems
Dr. Königs Märklin Digital Page - digital technical information
Gahler+Ringstmeier
HCC Modelbaanautomatisering - digital block based system
Kuehn - DCC decoders
Leon van Perlo - digital command control without decoders
Littfinski DatenTechnik - decoders and more for Märklin and DCC
MRDirect - digital system with 'Direct Drive'
Open DCC - DIY DCC system, decoders and s88-N information
Rutger Friberg - model railroad electronics
Wikinger locdecoder
Wiring for DCC