Does anybody know how MSTS calculates the gradients for curved track? I do N o t reflect to the well known gradient chart. I did some regrading on a route and discovered some aberrations to the calculated height values. For example an a2t1500r5 on a 1 degree Grade(MSTS 1.000) should be 2.28106 m higher at the upper end. In fact it is only 2.08103 m higher. That is a noticable difference and it affects all curved tracks. But I found no formula except trial and error to predict the aberration. Any hints welcome.