Brand New Straight Connector: Miniature Straight Connector, H Compatible with Track, Black, 1 Circuits Track connectors join lengths of rail or plug the ends of rail for a finished look. They make secure connections to prevent rails from detaching and disrupting the electrical feed, which could cause light heads to flicker or lose power. Also known as track lighting rail connectors, they are used for applications such as continuing a straight line of track, joining rails at an angle, or making a three-way connection to set rails into two different directions. They mate only with rails of the same style (J, H, or L)