Dictionary.com
definitions

plate rail

noun
  1. a rail or narrow shelf fixed along a wall to hold plates, especially for ornament or display.

Origin of plate rail

First recorded in 1815–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for plate rail

plate rail

noun
  1. railways an early flat rail with an extended flange on its outer edge to retain wheels on the trackSometimes shortened to: plate
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012