underchain haulage

underchain haulage

[¦ən·dər¦chān ′hȯl·ij]
(mining engineering)
Haulage in which the chains are placed beneath the mine car at certain intervals with suitable hooks that thrust against the car axle.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.