diff --git a/StarterNG.Tests/CouplerLookTests.cs b/StarterNG.Tests/CouplerLookTests.cs
new file mode 100644
index 0000000..6573914
--- /dev/null
+++ b/StarterNG.Tests/CouplerLookTests.cs
@@ -0,0 +1,25 @@
+using StarterNG.Classes;
+using StarterNG.Views;
+
+namespace StarterNG.Tests;
+
+public class CouplerLookTests
+{
+    [Theory]
+    [InlineData("0", CouplerState.Free)]
+    [InlineData("3", CouplerState.Coupled)]
+    [InlineData("7", CouplerState.MultipleUnit)]
+    [InlineData("131", CouplerState.Permanent)]
+    [InlineData("-3", CouplerState.Permanent)]
+    [InlineData("0.BP", CouplerState.Free)]
+    public void A_coupler_between_vehicles_reads_by_what_it_connects(string code, CouplerState expected) =>
+        Assert.Equal(expected, CouplerLook.StateOf(Coupling.Parse(code), trailing: false));
+
+    [Theory]
+    [InlineData("0", CouplerState.EndSignals)]
+    [InlineData("0.BP", CouplerState.EndSignals)]
+    [InlineData("3", CouplerState.CoupledBehind)]
+    [InlineData("-7", CouplerState.CoupledBehind)]
+    public void The_back_of_the_train_gets_end_signals_only_at_0(string code, CouplerState expected) =>
+        Assert.Equal(expected, CouplerLook.StateOf(Coupling.Parse(code), trailing: true));
+}
diff --git a/StarterNG/Views/Depot/CouplerLook.cs b/StarterNG/Views/Depot/CouplerLook.cs
new file mode 100644
index 0000000..29919b4
--- /dev/null
+++ b/StarterNG/Views/Depot/CouplerLook.cs
@@ -0,0 +1,95 @@
+using System.Collections.Generic;
+using System.Linq;
+using Avalonia.Media;
+using StarterNG.Classes;
+
+namespace StarterNG.Views;
+
+public enum CouplerState
+{
+    /// <summary>Nothing connected between the two vehicles.</summary>
+    Free,
+
+    /// <summary>Coupled the ordinary way: mechanically, the brake pipe and so on.</summary>
+    Coupled,
+
+    /// <summary>Coupled with multiple-unit control.</summary>
+    MultipleUnit,
+
+    /// <summary>Not to be parted in shunting: workshop lock, or a locked coupler.</summary>
+    Permanent,
+
+    /// <summary>The back of the train at 0 - the simulator puts up the end signals.</summary>
+    EndSignals,
+
+    /// <summary>The back of the train coupled to whatever stands behind it - no end signals.</summary>
+    CoupledBehind
+}
+
+/// <summary>How a coupler is drawn on the consist strip, so its state reads at a glance.</summary>
+public static class CouplerLook
+{
+    private static readonly IBrush Dim = new SolidColorBrush(Color.Parse("#808080"));
+    private static readonly IBrush Green = new SolidColorBrush(Color.Parse("#41C400"));
+    private static readonly IBrush Blue = new SolidColorBrush(Color.Parse("#4AA3FF"));
+    private static readonly IBrush Red = new SolidColorBrush(Color.Parse("#E5484D"));
+    private static readonly IBrush Amber = new SolidColorBrush(Color.Parse("#E0A030"));
+
+    public static CouplerState StateOf(Coupling coupling, bool trailing)
+    {
+        int flags = coupling.AbsFlags;
+        if (trailing)
+            return flags == 0 ? CouplerState.EndSignals : CouplerState.CoupledBehind;
+        if (flags == 0)
+            return CouplerState.Free;
+        if (coupling.Locked || (flags & Coupling.WorkshopLock) != 0)
+            return CouplerState.Permanent;
+        return (flags & Coupling.ControlMU) != 0 ? CouplerState.MultipleUnit : CouplerState.Coupled;
+    }
+
+    // Box drawing and a plain disc: Windows draws no colour emoji for these.
+    public static string Glyph(CouplerState state) => state switch
+    {
+        CouplerState.Free => "╎",
+        CouplerState.Permanent => "═",
+        CouplerState.EndSignals => "●",
+        _ => "≣"
+    };
+
+    /// <summary>The colour of the glyph; null keeps the ordinary text colour.</summary>
+    public static IBrush? Brush(CouplerState state) => state switch
+    {
+        CouplerState.Free => Dim,
+        CouplerState.MultipleUnit => Green,
+        CouplerState.Permanent => Blue,
+        CouplerState.EndSignals => Red,
+        CouplerState.CoupledBehind => Amber,
+        _ => null
+    };
+
+    /// <summary>What the coupler connects, by the names the coupler editor uses.</summary>
+    public static IReadOnlyList<string> Connections(Coupling coupling) =>
+        Enumerable.Range(0, CouplingBits.BitKeys.Length)
+                  .Where(i => coupling.Has(1 << i))
+                  .Select(i => App.Loc[CouplingBits.BitKeys[i]])
+                  .ToList();
+
+    /// <summary>The tooltip: the code as the scenery has it, then what it means.</summary>
+    public static string Describe(Coupling coupling, bool trailing)
+    {
+        string connections = string.Join(", ", Connections(coupling));
+        string meaning = StateOf(coupling, trailing) switch
+        {
+            CouplerState.Free => App.Loc["CouplerFree"],
+            CouplerState.EndSignals => App.Loc["CouplerEndSignals"],
+            CouplerState.CoupledBehind => string.Format(App.Loc["CouplerCoupledBehind"], connections),
+            _ => string.Format(App.Loc["CouplerConnects"], connections)
+        };
+
+        var lines = new List<string> { string.Format(App.Loc["CouplerCode"], coupling.Flags), meaning };
+        if (coupling.Locked && coupling.AbsFlags != 0)
+            lines.Add(App.Loc["CouplerLocked"]);
+        lines.Add(App.Loc["CouplerClickToEdit"]);
+        return string.Join("\n", lines);
+    }
+}
diff --git a/StarterNG/Views/Depot/VehicleCards.cs b/StarterNG/Views/Depot/VehicleCards.cs
index e3c03b9..08a0dd5 100644
--- a/StarterNG/Views/Depot/VehicleCards.cs
+++ b/StarterNG/Views/Depot/VehicleCards.cs
@@ -406,13 +406,16 @@ public sealed class VehicleCards
         flyout.ShowAt(anchor);
     }
 
+    /// <summary>
+    /// The coupler after a unit, drawn by its state - free, coupled, multiple-unit,
+    /// permanent, and at the back of the train whether the end signals go up.
+    /// </summary>
     public Control BuildCoupler(ConsistItem item, bool trailing = false)
     {
+        var coupling = Consist.TailCar(item).Coupling;
         var glyph = new TextBlock
         {
-            Text = trailing ? "╡" : "≣",
             FontSize = 18,
-            Opacity = trailing ? 0.55 : 0.7,
             VerticalAlignment = VerticalAlignment.Center,
             HorizontalAlignment = HorizontalAlignment.Center
         };
@@ -422,24 +425,55 @@ public sealed class VehicleCards
             MinWidth = 0,
             Cursor = _hand,
             VerticalAlignment = VerticalAlignment.Center,
-            Content = glyph,
-            Flyout = new Flyout
-            {
-                Content = BuildCouplingBox(item),
-                Placement = PlacementMode.Top
-            }
+            Content = glyph
         };
         coupler.Classes.Add("Basic");
-        ToolTip.SetTip(coupler, $"{App.Loc["Coupling"]} — {App.Loc["TipReorder"]}");
+
+        void Restyle()
+        {
+            var state = CouplerLook.StateOf(coupling, trailing);
+            glyph.Text = CouplerLook.Glyph(state);
+            if (CouplerLook.Brush(state) is { } brush)
+            {
+                glyph.Foreground = brush;
+                glyph.Opacity = 1;
+            }
+            else
+            {
+                glyph.ClearValue(TextBlock.ForegroundProperty);
+                glyph.Opacity = 0.7;
+            }
+            ToolTip.SetTip(coupler, CouplerLook.Describe(coupling, trailing));
+        }
+
+        Restyle();
+        coupler.Flyout = new Flyout
+        {
+            Content = BuildCouplingBox(item, Restyle),
+            Placement = PlacementMode.Top
+        };
         return coupler;
     }
 
-    private Control BuildCouplingBox(ConsistItem item)
+    /// <summary>
+    /// Edits the coupler in place, so the flyout stays open while bits are
+    /// ticked; <paramref name="changed"/> redraws the coupler it hangs off.
+    /// </summary>
+    private Control BuildCouplingBox(ConsistItem item, Action changed)
     {
         var d = Consist.TailCar(item);
         int unitIdx = _consist.IndexOf(item);
 
         var panel = new StackPanel { Spacing = 2 };
+        var checks = new List<(CheckBox Check, int Bit)>();
+        bool syncing = false;
+
+        void Changed()
+        {
+            d.CouplerSetByHand = true;
+            changed();
+            _refreshDetails();
+        }
 
         var copy = new Button
         {
@@ -456,7 +490,11 @@ public sealed class VehicleCards
         {
             if (unitIdx <= 0) return;
             d.Coupling.Flags = Consist.TailCar(_consist[unitIdx - 1]).Coupling.Flags;
-            _redraw();
+            syncing = true;
+            foreach (var (check, bit) in checks)
+                check.IsChecked = d.Coupling.Has(bit);
+            syncing = false;
+            Changed();
         };
 
         var header = new DockPanel { Margin = new Thickness(0, 0, 0, 2) };
@@ -489,7 +527,13 @@ public sealed class VehicleCards
                 IsChecked = d.Coupling.Has(bit),
                 FontSize = 12
             };
-            check.IsCheckedChanged += (_, _) => d.Coupling.Set(bit, check.IsChecked == true);
+            check.IsCheckedChanged += (_, _) =>
+            {
+                if (syncing) return;
+                d.Coupling.Set(bit, check.IsChecked == true);
+                Changed();
+            };
+            checks.Add((check, bit));
             Grid.SetRow(check, i / 2);
             Grid.SetColumn(check, i % 2);
             grid.Children.Add(check);
diff --git a/StarterNG/Views/Depot/VehicleDetails.cs b/StarterNG/Views/Depot/VehicleDetails.cs
index 9c31911..294b09c 100644
--- a/StarterNG/Views/Depot/VehicleDetails.cs
+++ b/StarterNG/Views/Depot/VehicleDetails.cs
@@ -178,10 +178,6 @@ public sealed class VehicleDetails
         if (unitIdx < 0)
             return;
 
-        bool isLast = unitIdx >= _consist.Count - 1;
-        if (isLast)
-            couplerPanel.Children.Add(PanelNote(App.Loc["CouplingLastNote"]));
-
         var d = Consist.TailCar(item);
 
         // Two columns: the tab is wide enough and the list is short enough
diff --git a/StarterNG/startercfg/lang/cz.xml b/StarterNG/startercfg/lang/cz.xml
index 99a09a8..1c15353 100644
--- a/StarterNG/startercfg/lang/cz.xml
+++ b/StarterNG/startercfg/lang/cz.xml
@@ -284,10 +284,15 @@
     <String key="TipSplit">Rozdělit jednotku na jednotlivé vozy</String>
     <String key="AppliesToUnit">Společné pro celou jednotku</String>
     <String key="CouplingUnitRear">Spřáhlo na konci jednotky</String>
-    <String key="CouplingLastNote">Poslední vozidlo: spřáhlo 0 dává koncovky, jiný kód spojí soupravu s tím, co stojí za ní, bez koncovek. Starter zde po každé změně soupravy nastaví 0, pokud spřáhlo nenastavíte ručně; „Auto“ vždy vrátí 0.</String>
     <String key="Join">Spojit</String>
     <String key="TipJoin">Spojit toto vozidlo s následujícím do jedné jednotky</String>
-    <String key="TipReorder">Přetáhněte pro změnu pořadí</String>
+    <String key="CouplerCode">Kód spřáhla: {0}</String>
+    <String key="CouplerFree">Vozidla nejsou spojena.</String>
+    <String key="CouplerConnects">Spojeno: {0}</String>
+    <String key="CouplerEndSignals">Konec soupravy — simulátor vyvěsí koncovky.</String>
+    <String key="CouplerCoupledBehind">Konec soupravy se spřáhne s tím, co stojí za ní ({0}) — bez koncovek.</String>
+    <String key="CouplerLocked">Zablokováno — při posunu se nerozpojí.</String>
+    <String key="CouplerClickToEdit">Klikněte pro změnu.</String>
     <String key="AddVehicle">Přidat</String>
     <String key="AddMany">Přidat vícekrát…</String>
     <String key="AddManyCount">Kolikrát vozidlo přidat</String>
diff --git a/StarterNG/startercfg/lang/en.xml b/StarterNG/startercfg/lang/en.xml
index 41e2a66..68b997a 100644
--- a/StarterNG/startercfg/lang/en.xml
+++ b/StarterNG/startercfg/lang/en.xml
@@ -284,10 +284,15 @@
     <String key="TipSplit">Split the unit into individual cars</String>
     <String key="AppliesToUnit">Shared by the whole unit</String>
     <String key="CouplingUnitRear">Coupler at the rear of the unit</String>
-    <String key="CouplingLastNote">Last vehicle: coupler 0 gets the end signals; any other code couples the train to whatever stands behind it, with no end signals. The starter sets 0 here after every change to the consist, unless you set the coupler by hand; “Auto” always brings 0 back.</String>
     <String key="Join">Join</String>
     <String key="TipJoin">Couple this vehicle with the next one into a single unit</String>
-    <String key="TipReorder">Drag to reorder</String>
+    <String key="CouplerCode">Coupler code: {0}</String>
+    <String key="CouplerFree">The vehicles are not coupled.</String>
+    <String key="CouplerConnects">Connected: {0}</String>
+    <String key="CouplerEndSignals">End of the train — the simulator puts up the end signals.</String>
+    <String key="CouplerCoupledBehind">The end of the train couples to whatever stands behind it ({0}) — no end signals.</String>
+    <String key="CouplerLocked">Locked — not uncoupled in shunting.</String>
+    <String key="CouplerClickToEdit">Click to change.</String>
     <String key="AddVehicle">Add</String>
     <String key="AddMany">Add several…</String>
     <String key="AddManyCount">How many times to add it</String>
diff --git a/StarterNG/startercfg/lang/hu.xml b/StarterNG/startercfg/lang/hu.xml
index bd1f31a..0cb254b 100644
--- a/StarterNG/startercfg/lang/hu.xml
+++ b/StarterNG/startercfg/lang/hu.xml
@@ -284,10 +284,15 @@
     <String key="TipSplit">Az egység szétbontása külön kocsikra</String>
     <String key="AppliesToUnit">Az egész egységre közös</String>
     <String key="CouplingUnitRear">Az egység végén lévő kapcsolókészülék</String>
-    <String key="CouplingLastNote">Utolsó jármű: a 0-s kapcsolat adja a zárjelzőket, más kód a mögötte állóhoz kapcsolja a szerelvényt, zárjelzők nélkül. A starter minden szerelvényváltozás után 0-ra állítja, hacsak kézzel nem állítod be; az „Auto” mindig visszaállítja a 0-t.</String>
     <String key="Join">Összekapcsolás</String>
     <String key="TipJoin">A jármű összekapcsolása a következővel egy egységgé</String>
-    <String key="TipReorder">Húzza az átrendezéshez</String>
+    <String key="CouplerCode">Kapcsolat kódja: {0}</String>
+    <String key="CouplerFree">A járművek nincsenek összekapcsolva.</String>
+    <String key="CouplerConnects">Összekapcsolva: {0}</String>
+    <String key="CouplerEndSignals">A szerelvény vége — a szimulátor kiteszi a zárjelzőket.</String>
+    <String key="CouplerCoupledBehind">A szerelvény vége összekapcsolódik a mögötte állóval ({0}) — zárjelzők nélkül.</String>
+    <String key="CouplerLocked">Zárolva — tolatáskor nem bontható.</String>
+    <String key="CouplerClickToEdit">Kattints a módosításhoz.</String>
     <String key="AddVehicle">Hozzáadás</String>
     <String key="AddMany">Hozzáadás többször…</String>
     <String key="AddManyCount">Hányszor add hozzá a járművet</String>
diff --git a/StarterNG/startercfg/lang/pl.xml b/StarterNG/startercfg/lang/pl.xml
index 4def396..4e6a65d 100644
--- a/StarterNG/startercfg/lang/pl.xml
+++ b/StarterNG/startercfg/lang/pl.xml
@@ -284,10 +284,15 @@
     <String key="TipSplit">Rozdziel zespół na pojedyncze człony</String>
     <String key="AppliesToUnit">Ustawienie wspólne dla całego zespołu</String>
     <String key="CouplingUnitRear">Sprzęg na końcu zespołu</String>
-    <String key="CouplingLastNote">Ostatni pojazd: sprzęg 0 daje końcówki, a inny kod połączy skład z tym, co stoi za nim, bez końcówek. Starter ustawia tu 0 po każdej zmianie składu, chyba że ustawisz sprzęg ręcznie; „Auto” zawsze przywraca 0.</String>
     <String key="Join">Złącz</String>
     <String key="TipJoin">Połącz ten pojazd z następnym w jeden zespół</String>
-    <String key="TipReorder">Przeciągnij, aby zmienić kolejność</String>
+    <String key="CouplerCode">Kod sprzęgu: {0}</String>
+    <String key="CouplerFree">Pojazdy nie są połączone.</String>
+    <String key="CouplerConnects">Połączone: {0}</String>
+    <String key="CouplerEndSignals">Koniec składu — symulator wystawi końcówki.</String>
+    <String key="CouplerCoupledBehind">Koniec składu sprzęgnie się z tym, co stoi za nim ({0}) — bez końcówek.</String>
+    <String key="CouplerLocked">Zablokowany — nie rozprzęga się przy manewrach.</String>
+    <String key="CouplerClickToEdit">Kliknij, aby zmienić.</String>
     <String key="AddVehicle">Dodaj</String>
     <String key="AddMany">Dodaj wiele…</String>
     <String key="AddManyCount">Ile razy dodać pojazd</String>
diff --git a/StarterNG/startercfg/lang/ru.xml b/StarterNG/startercfg/lang/ru.xml
index 281e700..b0c32ee 100644
--- a/StarterNG/startercfg/lang/ru.xml
+++ b/StarterNG/startercfg/lang/ru.xml
@@ -284,10 +284,15 @@
     <String key="TipSplit">Разделить сцеп на отдельные вагоны</String>
     <String key="AppliesToUnit">Общее для всего состава</String>
     <String key="CouplingUnitRear">Сцепка в конце состава</String>
-    <String key="CouplingLastNote">Последняя единица: сцепка 0 даёт хвостовые сигналы, другой код сцепит состав с тем, что стоит за ним, без хвостовых сигналов. Стартер ставит здесь 0 после каждого изменения состава, если вы не задали сцепку вручную; «Авто» всегда возвращает 0.</String>
     <String key="Join">Соединить</String>
     <String key="TipJoin">Соединить этот вагон со следующим в один состав</String>
-    <String key="TipReorder">Перетащите для изменения порядка</String>
+    <String key="CouplerCode">Код сцепки: {0}</String>
+    <String key="CouplerFree">Вагоны не сцеплены.</String>
+    <String key="CouplerConnects">Соединено: {0}</String>
+    <String key="CouplerEndSignals">Хвост поезда — симулятор вывесит хвостовые сигналы.</String>
+    <String key="CouplerCoupledBehind">Хвост поезда сцепится с тем, что стоит за ним ({0}) — без хвостовых сигналов.</String>
+    <String key="CouplerLocked">Заблокирована — не расцепляется при маневрах.</String>
+    <String key="CouplerClickToEdit">Нажмите, чтобы изменить.</String>
     <String key="AddVehicle">Добавить</String>
     <String key="AddMany">Добавить несколько…</String>
     <String key="AddManyCount">Сколько раз добавить единицу</String>