![]() APB is probably the most common type of Automatic Block Signaling (ABS) for single track lines in North America.Ĭontrary to many of the single track ABS systems in use at the time APB not only protected trains running in the same direction but it also provided protection between opposing trains. of Rochester NY around 1910 and quickly became the most common type of single track ABS to be installed. APB was conceived by the General Railway Signal Co. Different railroads and different manufacturers have implemented different features in their APB systems but this document explains a common version that is often seen in textbooks. The APB is a special type of Automatic Block Signaling (ABS). This document explains the functions of the Absolute Permissive Block (APB) systems in use on single track lines across much of North America. ![]() LundstenĬontents An Absolute Permissive Block Line APB protection of trains Railroad Signalling: APB North American Signaling: Absolute Permissive Block
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