I suppose you're talking about his "Ks-Signale". Probably these links are useful:
 
BPanther's homepage: 
http://trainz.mbremer.de (scroll down for English pdf files)
 
hjnk's homepage: 
http://www.trainz-aktiv.de/html/ks-teststrecken.html and 
http://www.trainz-aktiv.de/html/ks-tut_s.html (unfortunately in German only)
 
Ks-signals in general: 
http://www.sh1.org/eisenbahn/shks.htm (in English) and 
http://en.wikipedia.org/wiki/German_railway_signalling