A track assembly for positioning and removably securing wheelchairs and transit seats in a vehicle, having a first rail having a frame, the frame having a top surface, a first side surface, a second side surface, and a longitudinal axis. The track assembly further includes a plurality of apertures having a shape, the apertures evenly distributed within the top surface along the longitudinal axis of the frame, a plurality of channels connecting the first and second side surfaces proximate the top surface, the channels evenly distributed along the longitudinal axis of the frame, and a second rail identical to and arranged in parallel with the first rail to form the track assembly.

A seat slide device is fixed to the floor of a vehicle and includes lower rails, each of which includes a front range and a rear range and extends forward and backward, and an upper rail supporting a movable seat and capable of moving over the lower rails. The seat slide device also includes a lock portion, a stopper, and a stopper-releasing operating portion. The lock portion selectively restricts movement of the upper rail on the lower rails at a plurality of positions. The lock portion is provided to the upper rail. The stopper stops movement of the upper rail before the upper rail advances from either one of the front range and the rear range, past this range, to the other range. The stopper-releasing operating portion enables movement of the upper rail when the upper rail has been stopped by the stopper.

A track fitting for securing a structure to an open-top channeled track may include at least one leaf having a flange portion that depends at an angle from a levering portion, and at least one fastener for connecting the levering portion to the structure, wherein in a secured condition, the flange portion is oriented for engagement with an underside of at least one of the two inwardly directed lips and the levering portion extends outside the open-top channel where the fastener secures the levering portion to the structure.

A track fitting for securing a structure to an open-top channeled track may include at least one leaf having a flange portion that depends at an angle from a levering portion, and at least one fastener for connecting the levering portion to the structure, wherein in a secured condition, the flange portion is oriented for engagement with an underside of at least one of the two inwardly directed lips and the levering portion extends outside the open-top channel where the fastener secures the levering portion to the structure.