I have used the jig in the photo to successfully cut many O gauge tracks. Works on 027 as well. Great tool. Place track upside down in the jig and cut with hack saw. Never really tried a Dremel tool or razor saw with it. As label notes, need to anchor the unit, which I did with vice grips. The label indicates where to purchase. I got this many years ago, so not sure still available.
Hope this helps,
Michael