What does APB mean in Railroads?

This page is about the meanings of the acronym/abbreviation/shorthand APB in the Regional field in general and in the Railroads terminology in particular.

Absolute Permissive Block

Railroad signalling system.

Regional » Railroads


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What does APB mean?

all-points bulletin.

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"APB." Abbreviations.com. STANDS4 LLC, 2014. Web. 20 Dec. 2014. <http://www.abbreviations.com/term/110905>.

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