MTH track question

their track pieces?

Not sure I understand what you mean. There are various sizes of straights and various diameters of curves. I thought it was pretty well spelled out in the MTH web site. Can you be more specific?

Are you aware that O-Gauge track curves are designated by their "diameter" and not radius? i.e. an 0-31 curve would be 31" across in a complete circle, 0-42 would be 42" across in a complete circle.

From that you can gather the radius information, with one small exception. Not all the O gauge manufacturers determine their diameter of track from the exact same reference point. By this I mean, some do not include the additional track ballast, some measure from the middle rail and other from the outside rail.

OK Marc, I see where you are coming from now. There are off the shelf programs with MTH track libraries already. If you trying to recreate these in another application, you'd probably have to get trigonometric data (correct term?) from MTH or one of the software vendors (RR-Track, for example). Don't expect quick response for this data would be high on their list of priorities, however I could be wrong about that.