Publisher's Synopsis
Excerpt from The Block System of Signaling on American Railroads: The Methods and Appliances Used in Manual and Automatic Block Signaling
The student of block signaling encounters interlock ing at almost every turn, and it is believed that no apology is necessary for adding to this work brief de scriptions of the principal types of interlocking ma chines in use in America. In these descriptions, as in those of the mechanical features of block signaling, the purpose has been to show the methods of working, rather than details of material or construction. Signals and signal machinery have been developed by many different engineers and inventors, and the experience and studies of these men have been extensive and varied; so that the number of devices having merit is large. To adequately describe these, or even to out line the present state of the art, would require a treatise, and lead beyond the scope of this work.
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