Does the Makita 55" track saw rail come with two connector bars so 2 rails can be joined together?

No, the rail connectors are sold separately in a single pack. We recommend two connectors for the best connection and straightest results.https://www.toolnut.com/makita-p-45777-guide-rail-connector-for-sp6000-track-saw.htmlFor a less expensive alternative, consider the Festool rail connectors.https://www.toolnut.com/festool-482107-2-guide-rail-connector-2-pack-fits-all-rails.html