chair-rail:cornice at the top of a dado around a room;
clamp rail:rebated timber to receive the ends of boards, as in a ceiling, etc., called batten or cleat in the USA;
dado-rail:as chair-rail above;
frieze rail:rail in a panelled door corresponding to the frieze in position;
hanging-rail:rail to which hinges are fixed in a door, window, etc. A rail with hinges at the side of a panelled door is a stile;
lock-rail:rail in a framed door into which the lock is fitted, usually corresponding to the top of a dado;
mid-rail:horizontal timber in a wall-frame placed half-way in a storey, or between a cill and a wall-plate.
Alcock, Barley, Dixon, & Meeson (1996);Gwilt (1903);W. McKay (1957)Papworth (1887)