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ballast pocket

American  

noun

Railroads.

  1. a depression that is formed beneath the ballast layer by penetration of ballast particles into the subgrade and that tends to collect moisture.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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