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Interlockings and towers are not the same thing, though interlocking machines are often located in towers -- as well as depots and cabins. Similarly, towers are used for lots of things other than housing an interlocking machine. So I'm not sure exactly which you're looking for -- if it's interlockings and interlocking machines, towers are really sort of ancillary. <br /> <br />The July 2003 issue had a large article on interlockings in Chicago. Further back, Trains did a special issue on towers in April 1995. Both are available as back issues. Ordering information is on the home page. <br /> <br />If you have access to a good academic library, try Railway Signal Engineer, which published from about 1910 to 1965 or so. It has hundreds of articles on interlockings.
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