You may not have discovered the Model Railway On-line Magazine. It's free and easily accessible from http://mrol.gppsoftware.com. We at MODRATEC are very impressed with the quality of this publication.
In it's most recent issue (Issue 6), MROL has begun a series of articles about railway signalling. We recommend this article for anyone interested in understanding more about signalling, and we have provided a set of SigScribe4 example files to complement the article so that you can experience interactively the matters being discussed. You'll find the examples at http://MODRATEC.com/ss4examples.php.
Examples complement magazine articles
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Examples complement magazine articles
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