Automatic merge of T1.5.1-1806-g5522fc5fa and 11 pull requests

- Pull request #570 at 362e4e7: glTF 2.0 support with PBR lighting
- Pull request #1062 at 1ec3dc6: Train Forces popup Window.
- Pull request #1064 at 1be1fc4: Add Train Info tab to Help window (F1)
- Pull request #1067 at 5bf4677: Traction and dynamic brake retardation
- Pull request #892 at 1f5ba4c: Signal Function OPP_SIG_ID_TRAINPATH
- Pull request #1074 at e9a66c1: Gradient - commit 2024-16-12
- Pull request #1076 at 3bbd537: Allow depart early
- Pull request #1085 at 37e2817: updates key commands for Train Operations window and also Daylight Offset
- Pull request #1086 at e10390b: Add Settings Exporter tool (copy settings to INI, etc)
- Pull request #1082 at 5845a1a: Allow variable water level in glass gauge
- Pull request #1081 at 689494b: Brake cuts power unification

Author: openrails-bot

Source/Documentation/Manual/driving.rst

@@ -510,7 +510,7 @@ which changes in discrete steps (MSTS legacy).
 
 Note: Because the graph is scaled by the most susceptible car,
 a red bar may not mean that the car will derail.
-When the car has a higher vertical force, it can tolerate higher forces than the most susceptible car.
+When the car has a higher vertical force, it can tolerate higher lateral forces than the most susceptible car.
 
 
 ``Brake Force``
@@ -522,8 +522,25 @@ The steps are non-linear, to provide more sensitivity near the small brake appli
 As the weight (and thus brake force varies greatly between cars (and especially engines),
 the graph can be quite jagged, even though all brake cylinders have the same pressure.
 Locomotives will show a full bar long before the brakes are fully applied.
+
 Dynamic braking is shown in blue (unless there also is a greater force from the air-brakes).
 
+``Text Line``
+'''''''''''''
+
+The text line at the bottom shows the following information.
+
+- Max Coupler: The current maximum coupler force within the train,
+  and the car (count from front, including locomotives) where the maximum force is.
+- Max Derail: The current maximum derail force within the train,
+  and the car (count from front, including locomotives) where the maximum force is.
+- Low Coupler: The lowest coupler strength within the train.
+- Low Derail: The lowest derail force within the train.
+  This is an estimate, based on the vertical force.
+  Dynamic factors also affect the force needed to derail.
+
+It may be necessary to scroll to see the rightmost parts of the line.
+
 F8 Switch Monitor
 -----------------