diff --git a/src/openrct2-ui/TextComposition.cpp b/src/openrct2-ui/TextComposition.cpp
index e33d0c8035..ef68feefc9 100644
--- a/src/openrct2-ui/TextComposition.cpp
+++ b/src/openrct2-ui/TextComposition.cpp
@@ -84,7 +84,7 @@ void TextComposition::HandleMessage(const SDL_Event* e)
                 Insert(e->text.text);
 
                 console.RefreshCaret(_session.SelectionStart);
-                WindowUpdateTextbox();
+                OpenRCT2::Ui::Windows::WindowUpdateTextbox();
             }
             break;
         case SDL_KEYDOWN:
@@ -127,7 +127,7 @@ void TextComposition::HandleMessage(const SDL_Event* e)
                         Delete();
 
                         console.RefreshCaret(_session.SelectionStart);
-                        WindowUpdateTextbox();
+                        OpenRCT2::Ui::Windows::WindowUpdateTextbox();
                     }
                     break;
                 case SDLK_HOME:
@@ -149,11 +149,11 @@ void TextComposition::HandleMessage(const SDL_Event* e)
                     _session.SelectionStart = startOffset;
                     Delete();
                     console.RefreshCaret(_session.SelectionStart);
-                    WindowUpdateTextbox();
+                    OpenRCT2::Ui::Windows::WindowUpdateTextbox();
                     break;
                 }
                 case SDLK_RETURN:
-                    WindowCancelTextbox();
+                    OpenRCT2::Ui::Windows::WindowCancelTextbox();
                     break;
                 case SDLK_LEFT:
                     if (modifier & KEYBOARD_PRIMARY_MODIFIER)
@@ -182,7 +182,7 @@ void TextComposition::HandleMessage(const SDL_Event* e)
                         utf8* text = SDL_GetClipboardText();
                         Insert(text);
                         SDL_free(text);
-                        WindowUpdateTextbox();
+                        OpenRCT2::Ui::Windows::WindowUpdateTextbox();
                     }
                     break;
             }
diff --git a/src/openrct2-ui/input/InputManager.cpp b/src/openrct2-ui/input/InputManager.cpp
index 8c4b32fec6..95ce7d9f3d 100644
--- a/src/openrct2-ui/input/InputManager.cpp
+++ b/src/openrct2-ui/input/InputManager.cpp
@@ -207,7 +207,7 @@ void InputManager::Process(const InputEvent& e)
                 return;
             }
 
-            if (gUsingWidgetTextBox)
+            if (OpenRCT2::Ui::Windows::IsUsingWidgetTextBox())
             {
                 return;
             }
@@ -383,7 +383,7 @@ bool InputManager::GetState(const ShortcutInput& shortcut) const
 
 bool InputManager::HasTextInputFocus() const
 {
-    if (gUsingWidgetTextBox || gChatOpen)
+    if (OpenRCT2::Ui::Windows::IsUsingWidgetTextBox() || gChatOpen)
         return true;
 
     auto w = WindowFindByClass(WindowClass::Textinput);
diff --git a/src/openrct2-ui/input/MouseInput.cpp b/src/openrct2-ui/input/MouseInput.cpp
index 03b44c2b8a..dddd437c94 100644
--- a/src/openrct2-ui/input/MouseInput.cpp
+++ b/src/openrct2-ui/input/MouseInput.cpp
@@ -1022,8 +1022,8 @@ static void InputWidgetLeft(const ScreenCoordsXY& screenCoords, WindowBase* w, W
     if (widgetIndex == -1)
         return;
 
-    if (windowClass != gCurrentTextBox.window.classification || windowNumber != gCurrentTextBox.window.number
-        || widgetIndex != gCurrentTextBox.widget_index)
+    if (windowClass != GetCurrentTextBox().window.classification || windowNumber != GetCurrentTextBox().window.number
+        || widgetIndex != GetCurrentTextBox().widget_index)
     {
         WindowCancelTextbox();
     }
diff --git a/src/openrct2-ui/interface/Widget.cpp b/src/openrct2-ui/interface/Widget.cpp
index f85879ecdb..5b467f4ecb 100644
--- a/src/openrct2-ui/interface/Widget.cpp
+++ b/src/openrct2-ui/interface/Widget.cpp
@@ -1137,8 +1137,9 @@ static void WidgetTextBoxDraw(DrawPixelInfo& dpi, WindowBase& w, WidgetIndex wid
     // Get the colour
     uint8_t colour = w.colours[widget.colour];
 
-    bool active = w.classification == gCurrentTextBox.window.classification && w.number == gCurrentTextBox.window.number
-        && widgetIndex == gCurrentTextBox.widget_index;
+    auto& tbIdent = OpenRCT2::Ui::Windows::GetCurrentTextBox();
+    bool active = w.classification == tbIdent.window.classification && w.number == tbIdent.window.number
+        && widgetIndex == tbIdent.widget_index;
 
     // GfxFillRectInset(dpi, l, t, r, b, colour, 0x20 | (!active ? 0x40 : 0x00));
     GfxFillRectInset(dpi, { topLeft, bottomRight }, colour, INSET_RECT_F_60);
@@ -1146,7 +1147,8 @@ static void WidgetTextBoxDraw(DrawPixelInfo& dpi, WindowBase& w, WidgetIndex wid
     // Figure out where the text should be positioned vertically.
     topLeft.y = w.windowPos.y + widget.textTop();
 
-    if (!active || gTextInput == nullptr)
+    auto* textInput = OpenRCT2::Ui::Windows::GetTextboxSession();
+    if (!active || textInput == nullptr)
     {
         if (widget.text != 0)
         {
@@ -1160,27 +1162,27 @@ static void WidgetTextBoxDraw(DrawPixelInfo& dpi, WindowBase& w, WidgetIndex wid
     // String length needs to add 12 either side of box
     // +13 for cursor when max length.
     u8string wrappedString;
-    GfxWrapString(gTextBoxInput, bottomRight.x - topLeft.x - 5 - 6, FontStyle::Medium, &wrappedString, nullptr);
+    GfxWrapString(*textInput->Buffer, bottomRight.x - topLeft.x - 5 - 6, FontStyle::Medium, &wrappedString, nullptr);
 
     DrawText(dpi, { topLeft.x + 2, topLeft.y }, { w.colours[1] }, wrappedString.c_str(), true);
 
     // Make a trimmed view of the string for measuring the width.
     int32_t curX = topLeft.x
         + GfxGetStringWidthNoFormatting(
-                       u8string_view{ wrappedString.c_str(), std::min(wrappedString.length(), gTextInput->SelectionStart) },
+                       u8string_view{ wrappedString.c_str(), std::min(wrappedString.length(), textInput->SelectionStart) },
                        FontStyle::Medium)
         + 3;
 
     int32_t width = 6;
-    if (static_cast<uint32_t>(gTextInput->SelectionStart) < gTextBoxInput.size())
+    if (static_cast<uint32_t>(textInput->SelectionStart) < textInput->Buffer->size())
     {
         // Make a new 1 character wide string for measuring the width
-        // of the character that the cursor is under.
+        // of the character that the cursor is under. (NOTE: this is broken for multi byte utf8 codepoints)
         width = std::max(
-            GfxGetStringWidthNoFormatting(u8string{ gTextBoxInput[gTextInput->SelectionStart] }, FontStyle::Medium) - 2, 4);
+            GfxGetStringWidthNoFormatting(u8string{ textInput->Buffer[textInput->SelectionStart] }, FontStyle::Medium) - 2, 4);
     }
 
-    if (gTextBoxFrameNo <= 15)
+    if (OpenRCT2::Ui::Windows::TextBoxCaretIsFlashed())
     {
         colour = ColourMapA[w.colours[1]].mid_light;
         auto y = topLeft.y + (widget.height() - 1);
diff --git a/src/openrct2-ui/interface/Window.cpp b/src/openrct2-ui/interface/Window.cpp
index f77343587f..f80393b5bf 100644
--- a/src/openrct2-ui/interface/Window.cpp
+++ b/src/openrct2-ui/interface/Window.cpp
@@ -835,6 +835,12 @@ ScreenCoordsXY WindowGetViewportSoundIconPos(WindowBase& w)
 
 namespace OpenRCT2::Ui::Windows
 {
+    static u8string _textBoxInput;
+    static int32_t _textBoxFrameNo = 0;
+    static bool _usingWidgetTextBox = false;
+    static TextInputSession* _textInput;
+    static WidgetIdentifier _currentTextBox = { { WindowClass::Null, 0 }, 0 };
+
     WindowBase* WindowGetListening()
     {
         for (auto it = g_window_list.rbegin(); it != g_window_list.rend(); it++)
@@ -859,4 +865,77 @@ namespace OpenRCT2::Ui::Windows
     {
         return window.classification;
     }
+
+    void WindowStartTextbox(const WindowBase& callW, WidgetIndex callWidget, u8string existingText, int32_t maxLength)
+    {
+        if (_usingWidgetTextBox)
+            WindowCancelTextbox();
+
+        _usingWidgetTextBox = true;
+        _currentTextBox.window.classification = callW.classification;
+        _currentTextBox.window.number = callW.number;
+        _currentTextBox.widget_index = callWidget;
+        _textBoxFrameNo = 0;
+
+        WindowCloseByClass(WindowClass::Textinput);
+
+        _textBoxInput = existingText;
+
+        _textInput = ContextStartTextInput(_textBoxInput, maxLength);
+    }
+
+    void WindowCancelTextbox()
+    {
+        if (_usingWidgetTextBox)
+        {
+            WindowBase* w = WindowFindByNumber(_currentTextBox.window.classification, _currentTextBox.window.number);
+            _currentTextBox.window.classification = WindowClass::Null;
+            _currentTextBox.window.number = 0;
+            ContextStopTextInput();
+            _usingWidgetTextBox = false;
+            if (w != nullptr)
+            {
+                WidgetInvalidate(*w, _currentTextBox.widget_index);
+            }
+            _currentTextBox.widget_index = static_cast<uint16_t>(WindowWidgetType::Last);
+        }
+    }
+
+    void WindowUpdateTextboxCaret()
+    {
+        _textBoxFrameNo++;
+        if (_textBoxFrameNo > 30)
+            _textBoxFrameNo = 0;
+    }
+
+    void WindowUpdateTextbox()
+    {
+        if (_usingWidgetTextBox)
+        {
+            _textBoxFrameNo = 0;
+            WindowBase* w = WindowFindByNumber(_currentTextBox.window.classification, _currentTextBox.window.number);
+            WidgetInvalidate(*w, _currentTextBox.widget_index);
+            w->OnTextInput(_currentTextBox.widget_index, _textBoxInput);
+        }
+    }
+    const TextInputSession* GetTextboxSession()
+    {
+        return _textInput;
+    }
+    void SetTexboxSession(TextInputSession* session)
+    {
+        _textInput = session;
+    }
+    bool IsUsingWidgetTextBox()
+    {
+        return _usingWidgetTextBox;
+    }
+    bool TextBoxCaretIsFlashed()
+    {
+        return _textBoxFrameNo <= 15;
+    }
+    const WidgetIdentifier& GetCurrentTextBox()
+    {
+        return _currentTextBox;
+    }
 } // namespace OpenRCT2::Ui::Windows
diff --git a/src/openrct2-ui/interface/Window.h b/src/openrct2-ui/interface/Window.h
index 4542f32638..b107f167e4 100644
--- a/src/openrct2-ui/interface/Window.h
+++ b/src/openrct2-ui/interface/Window.h
@@ -12,6 +12,8 @@
 #include <openrct2/interface/Window.h>
 #include <openrct2/interface/Window_internal.h>
 
+struct TextInputSession;
+
 struct Window : WindowBase
 {
     virtual void OnDraw(DrawPixelInfo& dpi) override;
@@ -73,4 +75,15 @@ namespace OpenRCT2::Ui::Windows
 
     WindowBase* WindowGetListening();
     WindowClass WindowGetClassification(const WindowBase& window);
+
+    void WindowStartTextbox(const WindowBase& callW, WidgetIndex callWidget, u8string existingText, int32_t maxLength);
+    void WindowCancelTextbox();
+    void WindowUpdateTextboxCaret();
+    void WindowUpdateTextbox();
+
+    const TextInputSession* GetTextboxSession();
+    void SetTexboxSession(TextInputSession* session);
+    bool IsUsingWidgetTextBox();
+    bool TextBoxCaretIsFlashed();
+    const WidgetIdentifier& GetCurrentTextBox();
 } // namespace OpenRCT2::Ui::Windows
diff --git a/src/openrct2-ui/scripting/CustomWindow.cpp b/src/openrct2-ui/scripting/CustomWindow.cpp
index ba513ce796..e0b8589bad 100644
--- a/src/openrct2-ui/scripting/CustomWindow.cpp
+++ b/src/openrct2-ui/scripting/CustomWindow.cpp
@@ -653,8 +653,7 @@ namespace OpenRCT2::Ui::Windows
                 }
                 else if (widgetDesc->Type == "textbox")
                 {
-                    auto* text = const_cast<char*>(widgetDesc->Text.c_str());
-                    WindowStartTextbox(*this, widgetIndex, STR_STRING, text, widgetDesc->MaxLength + 1);
+                    WindowStartTextbox(*this, widgetIndex, widgetDesc->Text, widgetDesc->MaxLength + 1);
                 }
             }
         }
diff --git a/src/openrct2-ui/windows/EditorObjectSelection.cpp b/src/openrct2-ui/windows/EditorObjectSelection.cpp
index fc1cc64269..7110640fdc 100644
--- a/src/openrct2-ui/windows/EditorObjectSelection.cpp
+++ b/src/openrct2-ui/windows/EditorObjectSelection.cpp
@@ -328,7 +328,7 @@ static std::vector<Widget> _window_editor_object_selection_widgets = {
 
         void OnUpdate() override
         {
-            if (gCurrentTextBox.window.classification == classification && gCurrentTextBox.window.number == number)
+            if (GetCurrentTextBox().window.classification == classification && GetCurrentTextBox().window.number == number)
             {
                 WindowUpdateTextboxCaret();
                 WidgetInvalidate(*this, WIDX_FILTER_TEXT_BOX);
@@ -422,7 +422,7 @@ static std::vector<Widget> _window_editor_object_selection_widgets = {
                     break;
                 }
                 case WIDX_FILTER_TEXT_BOX:
-                    WindowStartTextbox(*this, widgetIndex, STR_STRING, _filter_string, sizeof(_filter_string));
+                    WindowStartTextbox(*this, widgetIndex, _filter_string, sizeof(_filter_string));
                     break;
                 case WIDX_FILTER_CLEAR_BUTTON:
                     std::fill_n(_filter_string, sizeof(_filter_string), 0x00);
diff --git a/src/openrct2-ui/windows/NewRide.cpp b/src/openrct2-ui/windows/NewRide.cpp
index ef633f9f3f..ca64284f5e 100644
--- a/src/openrct2-ui/windows/NewRide.cpp
+++ b/src/openrct2-ui/windows/NewRide.cpp
@@ -325,7 +325,7 @@ static Widget window_new_ride_widgets[] = {
 
             WidgetInvalidate(*this, WIDX_TAB_1 + static_cast<int32_t>(_currentTab));
 
-            if (gCurrentTextBox.window.classification == classification && gCurrentTextBox.window.number == number)
+            if (GetCurrentTextBox().window.classification == classification && GetCurrentTextBox().window.number == number)
             {
                 WindowUpdateTextboxCaret();
                 WidgetInvalidate(*this, WIDX_FILTER_TEXT_BOX);
@@ -370,7 +370,7 @@ static Widget window_new_ride_widgets[] = {
                     SetPage(_currentTab);
                     break;
                 case WIDX_FILTER_TEXT_BOX:
-                    WindowStartTextbox(*this, widgetIndex, STR_STRING, _filter.data(), kTextInputSize);
+                    WindowStartTextbox(*this, widgetIndex, _filter, kTextInputSize);
                     break;
                 case WIDX_FILTER_CLEAR_BUTTON:
                     _filter.clear();
diff --git a/src/openrct2-ui/windows/Scenery.cpp b/src/openrct2-ui/windows/Scenery.cpp
index 5fdf66aaf6..327573e92a 100644
--- a/src/openrct2-ui/windows/Scenery.cpp
+++ b/src/openrct2-ui/windows/Scenery.cpp
@@ -276,7 +276,7 @@ static Widget WindowSceneryBaseWidgets[] = {
                     Invalidate();
                     break;
                 case WIDX_FILTER_TEXT_BOX:
-                    WindowStartTextbox(*this, widgetIndex, STR_STRING, _filteredSceneryTab.Filter.data(), kTextInputSize);
+                    WindowStartTextbox(*this, widgetIndex, _filteredSceneryTab.Filter, kTextInputSize);
                     break;
                 case WIDX_FILTER_CLEAR_BUTTON:
                     _tabEntries[_activeTabIndex].Filter.clear();
@@ -463,7 +463,7 @@ static Widget WindowSceneryBaseWidgets[] = {
                 }
             }
 
-            if (gCurrentTextBox.window.classification == classification && gCurrentTextBox.window.number == number)
+            if (GetCurrentTextBox().window.classification == classification && GetCurrentTextBox().window.number == number)
             {
                 WindowUpdateTextboxCaret();
                 WidgetInvalidate(*this, WIDX_FILTER_TEXT_BOX);
diff --git a/src/openrct2-ui/windows/ServerList.cpp b/src/openrct2-ui/windows/ServerList.cpp
index 29bb122642..840fc3642a 100644
--- a/src/openrct2-ui/windows/ServerList.cpp
+++ b/src/openrct2-ui/windows/ServerList.cpp
@@ -131,7 +131,7 @@ static Widget _serverListWidgets[] = {
                     Close();
                     break;
                 case WIDX_PLAYER_NAME_INPUT:
-                    WindowStartTextbox(*this, widgetIndex, STR_STRING, _playerName.c_str(), MaxPlayerNameLength);
+                    WindowStartTextbox(*this, widgetIndex, _playerName, MaxPlayerNameLength);
                     break;
                 case WIDX_LIST:
                 {
@@ -205,7 +205,7 @@ static Widget _serverListWidgets[] = {
 
         void OnUpdate() override
         {
-            if (gCurrentTextBox.window.classification == classification && gCurrentTextBox.window.number == number)
+            if (GetCurrentTextBox().window.classification == classification && GetCurrentTextBox().window.number == number)
             {
                 WindowUpdateTextboxCaret();
                 InvalidateWidget(WIDX_PLAYER_NAME_INPUT);
diff --git a/src/openrct2-ui/windows/ServerStart.cpp b/src/openrct2-ui/windows/ServerStart.cpp
index 7c1eae78d8..fcad422072 100644
--- a/src/openrct2-ui/windows/ServerStart.cpp
+++ b/src/openrct2-ui/windows/ServerStart.cpp
@@ -95,19 +95,19 @@ static Widget _windowServerStartWidgets[] = {
                     Close();
                     break;
                 case WIDX_PORT_INPUT:
-                    WindowStartTextbox(*this, widgetIndex, STR_STRING, _port, 6);
+                    WindowStartTextbox(*this, widgetIndex, _port, 6);
                     break;
                 case WIDX_NAME_INPUT:
-                    WindowStartTextbox(*this, widgetIndex, STR_STRING, _name, 64);
+                    WindowStartTextbox(*this, widgetIndex, _name, 64);
                     break;
                 case WIDX_DESCRIPTION_INPUT:
-                    WindowStartTextbox(*this, widgetIndex, STR_STRING, _description, MAX_SERVER_DESCRIPTION_LENGTH);
+                    WindowStartTextbox(*this, widgetIndex, _description, MAX_SERVER_DESCRIPTION_LENGTH);
                     break;
                 case WIDX_GREETING_INPUT:
-                    WindowStartTextbox(*this, widgetIndex, STR_STRING, _greeting, kChatInputSize);
+                    WindowStartTextbox(*this, widgetIndex, _greeting, kChatInputSize);
                     break;
                 case WIDX_PASSWORD_INPUT:
-                    WindowStartTextbox(*this, widgetIndex, STR_STRING, _password, 32);
+                    WindowStartTextbox(*this, widgetIndex, _password, 32);
                     break;
                 case WIDX_MAXPLAYERS_INCREASE:
                     if (gConfigNetwork.Maxplayers < 255)
@@ -154,7 +154,7 @@ static Widget _windowServerStartWidgets[] = {
         }
         void OnUpdate() override
         {
-            if (gCurrentTextBox.window.classification == classification && gCurrentTextBox.window.number == number)
+            if (GetCurrentTextBox().window.classification == classification && GetCurrentTextBox().window.number == number)
             {
                 WindowUpdateTextboxCaret();
                 WidgetInvalidate(*this, WIDX_NAME_INPUT);
diff --git a/src/openrct2-ui/windows/TextInput.cpp b/src/openrct2-ui/windows/TextInput.cpp
index ea78ce6948..b108f952f3 100644
--- a/src/openrct2-ui/windows/TextInput.cpp
+++ b/src/openrct2-ui/windows/TextInput.cpp
@@ -114,7 +114,7 @@ namespace OpenRCT2::Ui::Windows
             text = String::UTF8TruncateCodePoints(text, maxLength);
             _buffer = u8string{ text };
             _maxInputLength = maxLength;
-            gTextInput = ContextStartTextInput(_buffer, maxLength);
+            SetTexboxSession(ContextStartTextInput(_buffer, maxLength));
         }
 
         void SetCallback(std::function<void(std::string_view)> callback, std::function<void()> cancelCallback)
@@ -238,6 +238,7 @@ namespace OpenRCT2::Ui::Windows
             size_t char_count = 0;
             uint8_t cur_drawn = 0;
 
+            auto* textInput = GetTextboxSession();
             int32_t cursorX = 0;
             int32_t cursorY = 0;
             for (int32_t line = 0; line <= no_lines; line++)
@@ -246,22 +247,21 @@ namespace OpenRCT2::Ui::Windows
                 DrawText(dpi, screenCoords, { colours[1], FontStyle::Medium, TextAlignment::LEFT }, wrapPointer, true);
 
                 size_t string_length = GetStringSize(wrapPointer) - 1;
-
-                if (!cur_drawn && (gTextInput->SelectionStart <= char_count + string_length))
+                if (!cur_drawn && (textInput->SelectionStart <= char_count + string_length))
                 {
                     // Make a view of the string for measuring the width.
                     cursorX = windowPos.x + 13
                         + GfxGetStringWidthNoFormatting(
-                                  u8string_view{ wrapPointer, gTextInput->SelectionStart - char_count }, FontStyle::Medium);
+                                  u8string_view{ wrapPointer, textInput->SelectionStart - char_count }, FontStyle::Medium);
                     cursorY = screenCoords.y;
 
                     int32_t textWidth = 6;
-                    if (gTextInput->SelectionStart < strlen(_buffer.data()))
+                    if (textInput->SelectionStart < strlen(_buffer.data()))
                     {
                         // Make a 1 utf8-character wide string for measuring the width
                         // of the currently selected character.
                         utf8 tmp[5] = {}; // This is easier than setting temp_string[0..5]
-                        uint32_t codepoint = UTF8GetNext(_buffer.data() + gTextInput->SelectionStart, nullptr);
+                        uint32_t codepoint = UTF8GetNext(_buffer.data() + textInput->SelectionStart, nullptr);
                         UTF8WriteCodepoint(tmp, codepoint);
                         textWidth = std::max(GfxGetStringWidthNoFormatting(tmp, FontStyle::Medium) - 2, 4);
                     }
@@ -293,7 +293,7 @@ namespace OpenRCT2::Ui::Windows
             }
 
             // IME composition
-            if (!String::IsNullOrEmpty(gTextInput->ImeBuffer))
+            if (!String::IsNullOrEmpty(textInput->ImeBuffer))
             {
                 IMEComposition(cursorX, cursorY);
             }
diff --git a/src/openrct2-ui/windows/TrackList.cpp b/src/openrct2-ui/windows/TrackList.cpp
index 47e8b70fe0..b6fa8ff905 100644
--- a/src/openrct2-ui/windows/TrackList.cpp
+++ b/src/openrct2-ui/windows/TrackList.cpp
@@ -297,8 +297,7 @@ static Widget _trackListWidgets[] = {
                     }
                     break;
                 case WIDX_FILTER_STRING:
-                    WindowStartTextbox(
-                        *this, widgetIndex, STR_STRING, _filterString, sizeof(_filterString)); // TODO check this out
+                    WindowStartTextbox(*this, widgetIndex, _filterString, sizeof(_filterString));
                     break;
                 case WIDX_FILTER_CLEAR:
                     // Keep the highlighted item selected
@@ -434,7 +433,7 @@ static Widget _trackListWidgets[] = {
 
         void OnUpdate() override
         {
-            if (gCurrentTextBox.window.classification == classification && gCurrentTextBox.window.number == number)
+            if (GetCurrentTextBox().window.classification == classification && GetCurrentTextBox().window.number == number)
             {
                 WindowUpdateTextboxCaret();
                 WidgetInvalidate(*this, WIDX_FILTER_STRING); // TODO Check this
diff --git a/src/openrct2/interface/Window.cpp b/src/openrct2/interface/Window.cpp
index b8184d0a0c..80e4f3256c 100644
--- a/src/openrct2/interface/Window.cpp
+++ b/src/openrct2/interface/Window.cpp
@@ -45,12 +45,7 @@ using namespace OpenRCT2;
 std::list<std::shared_ptr<WindowBase>> g_window_list;
 WindowBase* gWindowAudioExclusive;
 
-WidgetIdentifier gCurrentTextBox = { { WindowClass::Null, 0 }, 0 };
 WindowCloseModifier gLastCloseModifier = { { WindowClass::Null, 0 }, CloseWindowModifier::None };
-u8string gTextBoxInput;
-int32_t gTextBoxFrameNo = 0;
-bool gUsingWidgetTextBox = false;
-TextInputSession* gTextInput;
 
 uint32_t gWindowUpdateTicks;
 uint16_t gWindowMapFlashingFlags;
@@ -1649,70 +1644,6 @@ void TextinputCancel()
     WindowCloseByClass(WindowClass::Textinput);
 }
 
-void WindowStartTextbox(
-    WindowBase& call_w, WidgetIndex call_widget, StringId existing_text, const char* existing_args, int32_t maxLength)
-{
-    if (gUsingWidgetTextBox)
-        WindowCancelTextbox();
-
-    gUsingWidgetTextBox = true;
-    gCurrentTextBox.window.classification = call_w.classification;
-    gCurrentTextBox.window.number = call_w.number;
-    gCurrentTextBox.widget_index = call_widget;
-    gTextBoxFrameNo = 0;
-
-    WindowCloseByClass(WindowClass::Textinput);
-
-    // Clear the text input buffer
-    gTextBoxInput.clear();
-
-    // Enter in the text input buffer any existing
-    // text.
-    if (existing_text != STR_NONE)
-    {
-        char tempBuf[kTextInputSize]{};
-        size_t len = FormatStringLegacy(tempBuf, kTextInputSize, existing_text, &existing_args);
-        gTextBoxInput.assign(tempBuf, len);
-    }
-
-    gTextInput = ContextStartTextInput(gTextBoxInput, maxLength);
-}
-
-void WindowCancelTextbox()
-{
-    if (gUsingWidgetTextBox)
-    {
-        WindowBase* w = WindowFindByNumber(gCurrentTextBox.window.classification, gCurrentTextBox.window.number);
-        gCurrentTextBox.window.classification = WindowClass::Null;
-        gCurrentTextBox.window.number = 0;
-        ContextStopTextInput();
-        gUsingWidgetTextBox = false;
-        if (w != nullptr)
-        {
-            WidgetInvalidate(*w, gCurrentTextBox.widget_index);
-        }
-        gCurrentTextBox.widget_index = static_cast<uint16_t>(WindowWidgetType::Last);
-    }
-}
-
-void WindowUpdateTextboxCaret()
-{
-    gTextBoxFrameNo++;
-    if (gTextBoxFrameNo > 30)
-        gTextBoxFrameNo = 0;
-}
-
-void WindowUpdateTextbox()
-{
-    if (gUsingWidgetTextBox)
-    {
-        gTextBoxFrameNo = 0;
-        WindowBase* w = WindowFindByNumber(gCurrentTextBox.window.classification, gCurrentTextBox.window.number);
-        WidgetInvalidate(*w, gCurrentTextBox.widget_index);
-        w->OnTextInput(gCurrentTextBox.widget_index, gTextBoxInput);
-    }
-}
-
 bool WindowIsVisible(WindowBase& w)
 {
     // w->visibility is used to prevent repeat calculations within an iteration by caching the result
diff --git a/src/openrct2/interface/Window.h b/src/openrct2/interface/Window.h
index 7f05f7a0b6..814a6600e8 100644
--- a/src/openrct2/interface/Window.h
+++ b/src/openrct2/interface/Window.h
@@ -31,7 +31,6 @@
 struct DrawPixelInfo;
 struct WindowBase;
 struct TrackDesignFileRef;
-struct TextInputSession;
 struct ScenarioIndexEntry;
 struct WindowCloseModifier;
 
@@ -52,11 +51,6 @@ constexpr uint8_t kDropdownHeight = 12;
 constexpr uint16_t kTextInputSize = 1024;
 constexpr uint16_t kTopToolbarHeight = 27;
 
-extern u8string gTextBoxInput;
-extern int32_t gTextBoxFrameNo;
-extern bool gUsingWidgetTextBox;
-extern struct TextInputSession* gTextInput;
-
 using rct_windownumber = uint16_t;
 using WidgetIndex = int16_t;
 
@@ -72,7 +66,6 @@ struct WidgetIdentifier
     WidgetIndex widget_index;
 };
 
-extern WidgetIdentifier gCurrentTextBox;
 extern WindowCloseModifier gLastCloseModifier;
 
 using WidgetFlags = uint32_t;
@@ -631,12 +624,6 @@ void TextinputCancel();
 void WindowMoveAndSnap(WindowBase& w, ScreenCoordsXY newWindowCoords, int32_t snapProximity);
 int32_t WindowCanResize(const WindowBase& w);
 
-void WindowStartTextbox(
-    WindowBase& call_w, WidgetIndex call_widget, StringId existing_text, const char* existing_args, int32_t maxLength);
-void WindowCancelTextbox();
-void WindowUpdateTextboxCaret();
-void WindowUpdateTextbox();
-
 bool WindowIsVisible(WindowBase& w);
 
 bool SceneryToolIsActive();