International Railway Signals
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This monograph is the second edition of International Railway Signals. While it bears a substantial resemblance to the original study (1991) there are substantial changes. Terminology is a significant problem with railway safety devices. Signals, sign and markings were included in that first edition but a wide range of T-M forms were omitted including acoustical, radio aids and level/grade crossings. This is true both of terms and content. The summary of terms in this study contrasts with those of the railway database volume (2009): signals, signals, markers. That newer work includes a variety of terms not listed in the title and other apparatus. The diversity of railway devices is compounded by the lack of a more precise general term of railway signals that can encompass other forms. The earlier preface provided a sharp distinction between signals and signalling (the former is primary; the latter is peripheral). The latter term refers to the control and operation of signals and accompanying safety appliances and procedures (e.g., systems, block systems, interlockings, CTC, electronic configurations). While signalling is not a core issue in this study of apparatus devices producing messages and meanings it is an integral element of this study. The older edition often refers to messages but not the meaning. While message might encompass the meaning it is more accurate to speak of the physical appearance of the messages, and the semiotic meaning that becomes attached to the physical dimenson.