Note that my wife complains about any sounds I make in the basement.
I tried several things that did NOT work.
A 'Jorgensen' mitre hand saw, and a special order fine pitch metal cutting blade from Europe with teeth. Could not cut tubular track. I could see how this would be good for precise wood cutting.
An abrasive 12" wheel in my existing 12" mitre saw (I used to work for Skil), and a variable speed device to reduce the speed. Still too much noise, too hard to handle, too dangerous.
I ended up with a Delta combo belt sander used off of eBay, the seller happen to live in the Chicago suburbs like me. Has a vertical and a circular. I rough cut the track with either a hack saw or a Dremel, then square it off on the belt sander. The advantage to the belt sander is you can angle it just under 90 degrees so that there is a smaller gap at the top of the rails. I think Harbor Freight as something similar and so does Menards house brand.
Note that back when I worked at Skil, which became S-B Power Tool (B for Bosch), and then Robert Bosch Tool Company, they owned Dremel. Skil is now a brand name owned by a Chinese company with a French sounding name, and Bosch owns Dremel. Note that Dremel is a brand of rotary tool (that got drilled into our heads by the lawyers, they didn't want to loose the trademark Dremel, literally worth its weight in gold).
If you are going to get a Dremel, get one with speed control. And wear safety goggles.