Automatic merge of T1.5-rc1-41-g3023eb3df and 10 pull requests

- Pull request #570 at 824f96f: Experimental glTF 2.0 support with PBR lighting
- Pull request #630 at 704731a: Sky Color Fix (Addresses Trello Roadmap Card #367 for More accurate sunrise and sunset)
- Pull request #650 at 0106424: Renewed Russian translation up to 1.5-rc1 version
- Pull request #652 at 918fdb1: Add button functions to Raildriver
- Pull request #667 at aa5c629: Fix typo in Czech translation of menu
- Pull request #677 at e7564c0: Correct double heading bug
- Pull request #688 at e44897d: adds Help Icons to Video tab
- Pull request #690 at 3399d4b: Sync turntables and transfertables in multiplayer mode
- Pull request #692 at c82a76d: Italian translation for OR 1.5
- Pull request #699 at 6baf43d: Bug fix for https://bugs.launchpad.net/or/+bug/1987453. Web: HUD/Force Information, some labels not visible.

Source/Orts.Simulation/Simulation/RollingStocks/MSTSLocomotive.cs

@@ -1821,7 +1821,7 @@ public override void Update(float elapsedClockSeconds)
                 }
             }
 
-
+            
             var gearloco = this as MSTSDieselLocomotive;
 
             // pass gearbox command key to other gearboxes in the same locomotive
@@ -1832,21 +1832,22 @@ public override void Update(float elapsedClockSeconds)
                 int ii = 0;
                 foreach (var eng in gearloco.DieselEngines.DEList)
                 {
-                    if (gearloco.DieselEngines.Count != 0)
+                    // don't change the first engine as this is the reference for all the others
+                    if (ii != 0)
                     {
                         gearloco.DieselEngines[ii].GearBox.currentGearIndex = gearloco.DieselEngines[0].GearBox.CurrentGearIndex;
                     }
 
                     ii = ii + 1;
                 }
 
-                // pass gearbox command key to other locomotives in train
+                // pass gearbox command key to other locomotives in train, don't treat the player locomotive in this fashion.
                 foreach (TrainCar car in Train.Cars)
                 {
                     var dieselloco = this as MSTSDieselLocomotive;
                     var locog = car as MSTSDieselLocomotive;
 
-                    if (locog != null && dieselloco != null && car != this)
+                    if (locog != null && dieselloco != null && car != this && !locog.IsLeadLocomotive())
                     {
 
                         locog.DieselEngines[0].GearBox.currentGearIndex = dieselloco.DieselEngines[0].GearBox.CurrentGearIndex;
@@ -1857,12 +1858,10 @@ public override void Update(float elapsedClockSeconds)
                         locog.Simulator.Confirmer.ConfirmWithPerCent(CabControl.GearBox, CabSetting.Increase, locog.GearBoxController.CurrentNotch);
                         locog.AlerterReset(TCSEvent.GearBoxChanged);
                         locog.SignalGearBoxChangeEvents();
-
-                        previousChangedGearBoxNotch = GearBoxController.CurrentNotch; // reset loop until next gear change
-
-
                     }
                 }
+
+                previousChangedGearBoxNotch = GearBoxController.CurrentNotch; // reset loop until next gear change
             }
 
             TrainControlSystem.Update(elapsedClockSeconds);