I tried Google Earth Pro to measure gradients between two points to determine which end is the higher gradient. This is for Chester, VT. On Google Earth it shows an elevation of 603 at the station but in Trainz 184.93 after I laid some track and used the smooth gradient tool. Why the difference in elevations? Is Trainz based on height from sea level but what about Google Earth? The crossing to the south less than a mile does show a lower elevation in Trainz and Google Earth but in Google Earth the elevation at the crossing to the south is 579, a 24 ft difference but in Trainz it's 184.93 at the station and 170.90 at the crossing to the south, a 14 ft difference. I'm using a HOG DEM in Trainz and the terrain is very uneven as it is not graded for a railroad.