Automatic merge of T1.4-rc6-12-gfab59f576 and 9 pull requests

- Pull request #480 at 6bc94a9: Blueprint https://blueprints.launchpad.net/or/+spec/digital-alignment-in-3dcabs
- Pull request #503 at 8a7c2af: Update derailment functionality
- Pull request #508 at 21fb5e9: Blueprint https://blueprints.launchpad.net/or/+spec/odometer-cabview-controls
- Pull request #510 at d4d3256: Add performance monitoring for diesel mechanic locomotives and new parameters
- Pull request #512 at b76931f: Fixed dynamic brake being applied during standstill when dynamic brake blending is enabled
- Pull request #514 at 383d2a0: Bug fix for https://bugs.launchpad.net/or/+bug/1946373. The keywords should not be translated.
- Pull request #516 at 1498583: feat: Build Unstable Version as debug
- Pull request #517 at dc566d5: Strengthen Contributing guidance
- Pull request #518 at 59424c1: Added rules to policy page on website

Source/Documentation/Manual/physics.rst

@@ -4490,3 +4490,25 @@ Two other parameters in the Engine section of the ENG file are used by the TCS:
 
 - ``DoesBrakeCutPower( x )`` sets whether applying brake on the locomotive cuts the traction (1 for enabled, 0 for disabled)
 - ``BrakeCutsPowerAtBrakeCylinderPressure( x )`` sets the minimum pressure in the brake cylinder that cuts the traction (by default 4 PSI)
+
+
+Train Derailment
+----------------
+
+Open Rails calculates when it is likely that a train derailment has occurred. The derailment modeled is based upon the wheel climbing the rail 
+when the train is in a curve. Light (empty wagons) can sometimes derail due to 'string lining' where the train forces attempt to pull the train 
+in a straight line, rather then following the curve.
+
+OR calculates the Nadal Critera for each wagon, and then calculates the actual L/V ratio based upon the wagon weight and the relevant 
+"in train" forces. Open Rails uses some calculated default parameters for the various parameters required to determine the actual L/V
+ratio, however more accurate results will be obtained if actual parameters are entered into the ENG or WAG file. The derailment calculations 
+use information relating to the wagon dimensions, weight and wheel profile information.
+
+Wheel profile details can be entered with the following two parameters:
+
+- ``ORTSMaximumWheelFlangeAngle`` - Wheel flange angle is defined as the maximum angle of the wheel flange relative to the horizontal axis.
+UoM - Angle (deg, radians) - default is rad. Typically this value maybe between approx 60 and 75 degrees.
+
+- ``ORTSWheelFlangeLength`` - Wheel flange length is defined as the length of flange starting from the beginning of the maximum flange angle 
+to the point where flange angle reduces to 26.6 degrees. UoM - Distance (m, in, ft, etc) - default is m
+