Few queries

Question

Dear All 
 I have generated report of two Geom baselines existing and proposed and got the Track centers form Station base report for my 10km stretch, I have following queries: 
 1. Now I have change particular curve with respect to existing track, and now I want again the revised track centers of that particular stretch , Is there any command to get the report of that particular revised curve(from chainage to chainage) or i have to generate for full stretch to get report? For generating 10km station base report at every 10m interval takes lots and lots of time, sometimes to get this I have to keep my system running whole night. 
 2. When I export my Geom baseline to auto cad, and when I converted the spline to poly line , the distance between Track centers from the open rail station base report and from auto cad measuring dimension it is slightly differ. and particularly on curves. (sometimes comes 20-30mm) 
 3. Is there any other method to export open rail alignment to auto cad. 
 Please guide. 
 
 Regards 
 Shakun Rana

jpln · Answer

What do you export ? 2D or 3D ? 
 2D could keep arcs so reports and measurement in arcs should be the same. Spirals are not known in AutoCAD so they are a set of segments depending on the stroking setting. 
 3D can't keep any true geometry so stroking is used and could explain differences. 
 As long as AutoCAD only knows about lines and arcs (in a polyline) then export to DWG is the good way to export to AutoCAD. If you want a true geometry then you need a civil package on AutoCAD and the XML export is still the best (or IFC).