Automatic merge of T1.5.1-1201-g5d239654f2 and 18 pull requests

- Pull request #799 at dfc715e: Consolidated wind simulation
- Pull request #839 at d00beb9: First phase of https://blueprints.launchpad.net/or/+spec/additional-cruise-control-parameters
- Pull request #885 at 8f473ce: feat: Add notifications to Menu
- Pull request #891 at 9a1d6b2: Auto save
- Pull request #892 at 1f5ba4c: Signal Function OPP_SIG_ID_TRAINPATH
- Pull request #952 at 8347095: Investigation - Pulsing graphics
- Pull request #953 at a519452: Fix Lights Crash on Corrupt Shapes
- Pull request #954 at e715fa4: Multiple Track Profiles & Superelevation Improvements
- Pull request #962 at 46d0472: Fix pantographs on unpowered cars
- Pull request #972 at e90a2aa: On Map window color changed switch or signal is not changed
- Pull request #980 at a7406de: Downloading route content (Github, zip) second part 
- Pull request #981 at ef9b55d: Multiple type trainset lightglows
- Pull request #982 at efcf19c: WEB based Switch Panel enhancement: Alerter
- Pull request #983 at 202316e: WEB based Switch Panel bug: DPU window
- Pull request #984 at 0f8122e: Player train switching for timetable mode
- Pull request #985 at 4f42995: Correct bug with steam locomotive chuffing sound
- Pull request #900 at c27f32d: DMI updates
- Pull request #876 at f92de76: docs: add source for documents previously on website to source Documentation folder

Author: openrails-bot

Source/Orts.Simulation/Simulation/RollingStocks/MSTSSteamLocomotive.cs

@@ -3503,13 +3503,26 @@ private void UpdateFX(float elapsedClockSeconds)
                 // Variable is proportional to angular speed, value of 10 means 1 rotation/second.
                 // If wheel is not slipping then use normal wheel speed, this reduces oscillations in variable1 which causes issues with sounds.
 
-                if (SteamEngines[i].AttachedAxle.IsWheelSlip)
+                if (((Train.TrainType == Train.TRAINTYPE.PLAYER && !Train.Autopilot) || Train.TrainType == Train.TRAINTYPE.AI_PLAYERDRIVEN) && (Simulator.UseAdvancedAdhesion && !Simulator.Settings.SimpleControlPhysics))
                 {
-                    variable[i] = Math.Abs(SteamEngines[i].AttachedAxle.SlipSpeedMpS / SteamEngines[i].AttachedAxle.WheelRadiusM / MathHelper.Pi * 5);
+                    if (SteamEngines[i].AttachedAxle.IsWheelSlip)
+                    {
+                        variable[i] = Math.Abs(SteamEngines[i].AttachedAxle.SlipSpeedMpS / SteamEngines[i].AttachedAxle.WheelRadiusM / MathHelper.Pi * 5);
+                    }
+                    else
+                    {
+                        variable[i] = Math.Abs((float)SteamEngines[i].AttachedAxle.AxleSpeedMpS / SteamEngines[i].AttachedAxle.WheelRadiusM / MathHelper.Pi * 5);
+                    }
                 }
-                else
+                else 
+                // Axle code is not executed if it is an AI train, on Autopilot, or Simple adhesion or simple physics is selected. Hence must use wheelspeed in these instances
                 {
-                    variable[i] = Math.Abs((float)SteamEngines[i].AttachedAxle.AxleSpeedMpS / SteamEngines[i].AttachedAxle.WheelRadiusM / MathHelper.Pi * 5);
+                    if (WheelSlip)
+                        variable[i] = Math.Abs(WheelSpeedSlipMpS / SteamEngines[0].AttachedAxle.WheelRadiusM / MathHelper.Pi * 5);
+                    else
+                    {
+                        variable[i] = Math.Abs(WheelSpeedMpS / SteamEngines[0].AttachedAxle.WheelRadiusM / MathHelper.Pi * 5);
+                    }
                 }
 
                 variable[i] = ThrottlePercent == 0 ? 0 : variable[i];