Yeah, as above. They fit to to the standard Festool FS rails which you can buy in upto 5m lengths or join together to get long lengths.
Mind, if I'm just cutting something like cladding with it I'll often just ping a chalkline where I want the cut and cut it off the rali as the little red indicator on the saw is accurate enough and its easy enough to get cladding grade accuracy freehand.
