I am curious how people do this.  I have an exacto miter box, in fact two, one that will hold about 2" wide strips and one that will hold about 1 1/2".  One is plastic and came with a finer razor saw, the other uses a bigger and less fine razor saw.

When you want to cut something down though that is long but wider than will fit in a mitre box, how is the best way to do it?  I've been trying several ways and I have gotten pretty good, but I wish there were something more like a  miter box or guide for longer cuts. 

I'm sure someone on here will have an easy answer, that I just haven't thought of. 

Many times I can just score and snap, but once in a while it's something which is too thick for that method.

(note this is for N scale modelling but also for other things such as doll house making, which is a much bigger scale than N Scale ;^) )

Ray