A track saw is a plunge-cutting circular saw mated to an aluminum guide rail. Their unsurpassed accuracy, ease of use and clean cuts are why track saws have become so popular and it’s these qualities that make them perfect for cutting everything from veneer plywood for cabinets and built-ins to plywood and OSB for wall and floor sheathing. Track saws are also great for trimming doors and cutting off overhanging deck boards. Despite their increasing popularity, many folks have yet to use a track saw, so watch the video to see one in action.
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Tool Test: Track Saws 
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The dewalt track saw review was inaccurate. Dewalt does make a track connector.