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Thanks guys, I would still like to hear about the differences that are found on the different railroads. I understand different signaling methods are one of the things that gives railroads there individuality, and this is something I have great interest in. I also have another question about capacity. The question is what has more capacity, double track ABS (rule251) or single track CTC. I have read articles about railroads converting from DT ABS to 1MT CTC (IC's mainline,SP over Donner both under Mr. Moyers and a section of GTW). I can understand reducing the amount of track will reduce maintainance costs but how can they do this without decreasing capacity. I've seen where they claim that is not the case, claiming that DT ABS is like two one-way-streets where faster trains get stuck behind slower trains because of the inability to run around the slower ones outside of terminals. I can understand that concept. What I can't understand is how "two one-way-streets" would not have significantly more capacity than "one lane with sidings". perhaps some of you can enlighten me on what's really going on here. And while I'm on a question asking binge, one more. In the above scenario where DT ABS is converted to 1MT CTC, how much of the old signal system is used ? Any, or does it require a whole new installation ? or is it just a matter of adding controll points at key locations (and reverse signaling the remaining track)? [?]
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