A clamp for non-invasively attaching components to railroad track rails. The clamp provides a receiving slot for receiving a first flange of a track rail between upper and lower legs. Disposed within the slot is a resilient member or spring that is compressed when engaged by the first flange of the track rail. Compression of the resilient member allows for positioning a tab attached to a free end of the lower leg over an outside edge of a second flange of the track rail.