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American Railway Signaling Principles and Practices Symbols Aspects Ind ChapII
American Railway Signaling Principles and Practices
Symbols Aspects and Indications Chapter II
Copyright 1929
Approx 78 pages
In railway signaling, symbols are the characters used on drawings to represent signal and interlocking apparatus, tracks, buildings, bridges and various other parts of the railway structure.
Without the use of symbols, it would be extremely difficult for the engineer to express himself clearly or to design the apparatus, circuits, etc., without much extra labor and the possibility of misunderstanding between the designer and the mechanic building or installing the apparatus or circuits.
Symbols to be of use, however, must be understood by the designer and by him who is to read the plan, thus the necessity for standard symbols in any given field of endeavor. In railway signaling, standard symbols are the work of the Railway Signal Association and its successor, the Signal Section of the Engineering Division of the American Railway Association. The symbols, comprising 14 drawings, were prepared by a committee of signalmen and representatives of the various signal companies.
The portion of this chapter devoted to symbols will describe the symbols and their use; no attempt will be made to describe the signal apparatus, their use or operation, these features being covered in subsequent chapters.
Figure 1 shows the symbols used for signals. These symbols have been in general use for a number of years. The first or upper section of the figure shows the characteristics of the signals. It will be noted the columns have headings to indicate the general type of signal shown, while the headings for the lines indicate the kind of signaling and the various aspects that will be displayed. The first symbol in each column (numbered 1 to 7, inclusive) indicates type of signal, thus a heavy line at the top of the character representing a signal blade (No. 1), indicates a non-automatic, mechanical signal; a heavy line or block at the left end of the blade (No. 4) represents a semi-automatic stick signal, power-operated. The first symbol in each line (lettered A to E, inclusive) indicates whether the signaling is two or three-position, and, if three-position signaling, what positions are used. The various combinations are indicated by vertical and diagonal lines of ordinary width. Where two-position signaling is used these characters are not employed.
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