DeWalt DCS391N 18v XR 460 W 165mm Cordless Circular Saw Body Only | Powertool World
You can make the reg circ saw into a track saw by switching base plates. This is a standard setup in England I've seen https://www.partshopdirect.co.uk/dewalt-dcs575-dcs576-shoe-base-with-guide- rail-slots-pN472354/ : r/Dewalt
At Last DeWalt have a 18v Track/Rail Saw DCS572 - YouTube