The top rail of the bottom Sash and the bottom rail of the top Sash in a Double Hung window. These rails meet in the center of the window when window unit is in closed position. Check Rail equipped with either vinyl or rubber "bulb" weatherstrip.

Horizontal members of a double-hung window which come together.

The horizontal members of a tilt double-hung sash that meet, and the vertical members of a slide/by sash that meet.

On a double-hung window, the bottom rail of the upper sash and the upper rail of the lower sash, where the lock is mounted.

The top rail of the lower sash and the bottom rail of the upper sash which meet when a double-hung window is closed. Both pieces should be weather stripped for maximum weatherability.

The bottom horizontal member of the upper sash and the top horizontal member of the lower sash which meet at the middle of a double-hung window.

The horizontal wood parts of a sash are called rails. On a double hung window where both the upper and lower sash overlap both rails are called Check Rails.

The piece of rail which holds the inside of the wheel to stop the other wheel from going down the wrong side of the "frog". Also used on bridges etc. to help hold the wheels on the track.

In double-hung windows, this is the bottom rail of the upper sash and the upper rail of the lower sash, where the lock is mounted. It is also know as a Meeting Rail.

The bottom rail on the upper sash and the upper rail of the lower sash of a double-hung window unit, where the lock is mounted. Also referred to as a meeting rail.

Also called meeting rails, they are the top horizontal sash member of the bottom window and the bottom horizontal sash member of the top window in a double hung window that mate together tightly when closed, permitting no air passage between the sashes.