plain rail

plain rail

In a double-hung window, a meeting rail having the same thickness as other members of the frame of the sash.
References in periodicals archive ?
(2) Electric Arc Welding Track Repairs; for rail defects such as squats, wheel burns, gauge corner cracking all personnel to be certified in both manual and automatic flux cored and stick welding for carbon, Manganese, and HP335 rail (3) Grinding repair to Plain Rail, switches & crossings in carbon, tri-metal zone (TMZ) Manganese and HP335 steel.
(3) Grinding repair to plain Rail,switches and crossings in carbon TMZ and manganese steel.
Each COP Kit includes COP/Continuous Optics Platform (upper receiver/rail), forward assist, port door rod and cover, barrel nut, two center inserts, three Picatinny rails, three plain rails, 18 screws and an Allen wrench.