A rail system includes a first rail unit with a hook portion forming a recessed cavity with an opening. A resilient strip or cord is located within the recessed cavity and is at least partially exposed through the opening. A cam portion positioned apart from the hook portion has a detent and a recessed portion. A second rail unit, releasably fastenable to the first rail unit, has a first flange section insertable into the hook portion of the first rail unit to compress the strip or cord and a second flange section snappable into the recessed portion of the cam portion of the first rail unit. The first flange extends through the opening of the recessed cavity and an end surface of the first flange engages the strip or cord when the second rail unit is fastened to the first rail unit.