Please find some few useful (I believe they are) regression reports posted in the Files section:
Horizontal Regression Reports - Negative Slew means Track shifted to the left - OpenRail Files - OpenRail - Bentley Communities
Horizontal Regression Report with colors (Enhanced) - OpenRail Files - OpenRail - Bentley Communities
CheckIntegrity - Regression reports with color coding - OpenRail Files - OpenRail - Bentley Communities