Used a Makita Trimmer Router and guide. Attached a length of 9mm ply to the guide and cut a 110mm wide strip of the 19mm ply to use for the guide. Easy to manage but need to keep downward pressure on the router guide and the other hand to keep pressure down on the trimmer. I do a light 3mm deep rout first to ensure the groove is straight and correct. Then I do a 6mm cut then finally do the 8mm deep groove. This seems to give a good result. If the track piece is a corner and some straight I do the corner routing first then use a guide to drill 1/8" holes at the end away feom the corner. Place the trimmer bit in the drill hole then align the guides . Go to the end of the corner & do the same thing.

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