screw spike

screw spike

[′skrü ‚spīk]
(design engineering)
A large nail with a helical thread on the upper portion of the shank; used to fasten railroad rails to the ties.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The screw spikes of a few of the ties have risen slightly.