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Ummm, you have everyone here over the age of 40 weeping with nostalgia for all the things that could (and still can) be done with switches and relays. I guess it's fair to say a fully manual relay system can open switches and provide a two-color ABS system. I am tempted to say it could handle multiple colors because after all, traffic lights were around for 50 years + before anyone thought of putting microchips in them. I don't know about the ability to handle other variables (flashing lights) other than it takes a pretty tough fuse to handle a bridged circuit like that. <br /> <br />Overall, I'd say there's a hell of a lot you could do without resorting to computers. Lots of people know more than I do and I hope they'll post here. Strictly speaking, real CTC doesn't require a computer (it debut'ed in the 1920s, after all), but after a time I would think it could get very tiring trying to work a couple of circuit boards along with several rheostatic transformers. Probably cheaper to go the DCC route, too, but again I wait on my betters for that answer. <br /> <br />
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