Automatic merge of T1.5.1-1630-gf3424409b and 9 pull requests

- Pull request #900 at b54024b: DMI in 3D cab + two more dials
- Pull request #1030 at d3ae4a2: Refactor settings, in prep for settings exporter
- Pull request #892 at 1f5ba4c: Signal Function OPP_SIG_ID_TRAINPATH
- Pull request #961 at ffccb2e: Improvements for Power Supplies
- Pull request #1015 at 1ade99e: Enhancements for EP brakes
- Pull request #1029 at 31fd7d2: Superelevation Follow Up Fixes
- Pull request #1063 at 6c23191: Better Missing Track Section Error Message
- Pull request #1055 at 1a01818: Route Based TTrack Sounds
- Pull request #896 at f1681df: First implementation of https://blueprints.launchpad.net/or/+spec/specific-sounds-for-ai-trains

Author: openrails-bot

Source/Orts.Simulation/Simulation/Traveller.cs

@@ -261,7 +261,7 @@ public Traveller(TrackSectionsFile tSectionDat, TrackNode[] trackNodes, TrackNod
                     throw new InvalidDataException(String.Format("Track node {0} could not be found in the track database.", startTrackNode.UiD));
                 else
                 {
-                    throw new MissingTrackNodeException();
+                    throw new MissingTrackNodeException(tvs.ShapeIndex);
                 }
 
             }
@@ -295,7 +295,7 @@ public Traveller(TrackSectionsFile tSectionDat, TrackNode[] trackNodes, TrackNod
                         throw new InvalidDataException(String.Format("Track node {0} could not be found in the track database.", startTrackNode.UiD));
                     else
                     {
-                        throw new MissingTrackNodeException();
+                        throw new MissingTrackNodeException(tvs.ShapeIndex);
                     }
 
                 }
@@ -1358,9 +1358,12 @@ void InitFromCandidate(TrackNodeCandidate candidate)
 
         public sealed class MissingTrackNodeException : Exception
         {
-            public MissingTrackNodeException()
+            public readonly uint Index;
+
+            public MissingTrackNodeException(uint index)
                 : base("")
             {
+                Index = index;
             }
         }
     }

Source/RunActivity/Viewer3D/Processes/GameStateRunActivity.cs

@@ -1,4 +1,4 @@
-// COPYRIGHT 2021 by the Open Rails project.
+// COPYRIGHT 2021 by the Open Rails project.
 // 
 // This file is part of Open Rails.
 // 
@@ -281,8 +281,10 @@ internal override void Load()
                                 String.Join("\n", data.Select(d => "\u2022 " + d).ToArray())),
                                 Application.ProductName + " " + VersionInfo.VersionOrBuild, MessageBoxButtons.OK, MessageBoxIcon.Error);
                         else if (error is Traveller.MissingTrackNodeException)
-                            MessageBox.Show(String.Format("Open Rails detected a track section which is not present in tsection.dat and cannot continue.\n\n" +
-                                "Most likely you don't have the XTracks or Ytracks version needed for this route."));
+                            MessageBox.Show(String.Format("Open Rails detected a track shape index {0} which is not present in tsection.dat and cannot continue.\n\n" +
+                                "The version of standard tsection.dat may be out of date, or this route requires a custom tsection.dat.\n" +
+                                "Please check the route installation instructions to verify the required tsection.dat.",
+                                ((Traveller.MissingTrackNodeException)error).Index));
                         else if (error is FileNotFoundException)
                         {
                             MessageBox.Show(String.Format(