diff --git a/src/newgrf.cpp b/src/newgrf.cpp
index 063638ced2..63e095b2ad 100644
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -11732,3 +11732,22 @@ uint CountSelectedGRFs(GRFConfig *grfconf)
 	}
 	return i;
 }
+
+const char *GetExtendedVariableNameById(int id)
+{
+	extern const GRFVariableMapDefinition _grf_action2_remappable_variables[];
+	for (const GRFVariableMapDefinition *info = _grf_action2_remappable_variables; info->name != nullptr; info++) {
+		if (id == info->id) {
+			return info->name;
+		}
+	}
+
+	extern const GRFNameOnlyVariableMapDefinition _grf_action2_internal_variable_names[];
+	for (const GRFNameOnlyVariableMapDefinition *info = _grf_action2_internal_variable_names; info->name != nullptr; info++) {
+		if (id == info->id) {
+			return info->name;
+		}
+	}
+
+	return nullptr;
+}
diff --git a/src/newgrf.h b/src/newgrf.h
index 4cb2aaf4fd..ada81b9773 100644
--- a/src/newgrf.h
+++ b/src/newgrf.h
@@ -209,6 +209,22 @@ struct GRFVariableMapDefinition {
 	{}
 };
 
+struct GRFNameOnlyVariableMapDefinition {
+	const char *name; // nullptr indicates the end of the list
+	int id;
+
+	/** Create empty object used to identify the end of a list. */
+	GRFNameOnlyVariableMapDefinition() :
+		name(nullptr),
+		id(0)
+	{}
+
+	GRFNameOnlyVariableMapDefinition(int id, const char *name) :
+		name(name),
+		id(id)
+	{}
+};
+
 struct GRFVariableMapEntry {
 	uint16 id = 0;
 	uint8 feature = 0;
@@ -450,4 +466,6 @@ const char *GetFeatureString(GrfSpecFeature feature);
 
 void InitGRFGlobalVars();
 
+const char *GetExtendedVariableNameById(int id);
+
 #endif /* NEWGRF_H */
diff --git a/src/newgrf_debug_gui.cpp b/src/newgrf_debug_gui.cpp
index 1b87ea3ad2..b2fb1c1ea7 100644
--- a/src/newgrf_debug_gui.cpp
+++ b/src/newgrf_debug_gui.cpp
@@ -649,14 +649,11 @@ struct NewGRFInspectWindow : Window {
 			uint prefix_width = 0;
 			for (const NIVariable *niv = nif->variables; niv->name != nullptr; niv++) {
 				if (niv->var >= 0x100) {
-					extern const GRFVariableMapDefinition _grf_action2_remappable_variables[];
-					for (const GRFVariableMapDefinition *info = _grf_action2_remappable_variables; info->name != nullptr; info++) {
-						if (niv->var == info->id) {
-							char buf[512];
-							seprintf(buf, lastof(buf), "  %s: ", info->name);
-							prefix_width = std::max<uint>(prefix_width, GetStringBoundingBox(buf).width);
-							break;
-						}
+					const char *name = GetExtendedVariableNameById(niv->var);
+					if (name != nullptr) {
+						char buf[512];
+						seprintf(buf, lastof(buf), "  %s: ", name);
+						prefix_width = std::max<uint>(prefix_width, GetStringBoundingBox(buf).width);
 					}
 				}
 			}
@@ -670,26 +667,23 @@ struct NewGRFInspectWindow : Window {
 				if (HasVariableParameter(niv->var)) {
 					this->DrawString(r, i++, "  %02x[%02x]: %08x (%s)", niv->var, param, value, niv->name);
 				} else if (niv->var >= 0x100) {
-					extern const GRFVariableMapDefinition _grf_action2_remappable_variables[];
-					for (const GRFVariableMapDefinition *info = _grf_action2_remappable_variables; info->name != nullptr; info++) {
-						if (niv->var == info->id) {
-							if (_current_text_dir == TD_RTL) {
-								this->DrawString(r, i++, "  %s: %08x (%s)", info->name, value, niv->name);
-							} else {
-								if (this->log_console) DEBUG(misc, 0, "    %s: %08x (%s)", info->name, value, niv->name);
+					const char *name = GetExtendedVariableNameById(niv->var);
+					if (name != nullptr) {
+						if (_current_text_dir == TD_RTL) {
+							this->DrawString(r, i++, "  %s: %08x (%s)", name, value, niv->name);
+						} else {
+							if (this->log_console) DEBUG(misc, 0, "    %s: %08x (%s)", name, value, niv->name);
 
-								int offset = i - this->vscroll->GetPosition();
-								i++;
-								if (offset >= 0 && offset < this->vscroll->GetCapacity()) {
-									Rect sr = r.Shrink(WidgetDimensions::scaled.frametext).Shrink(0, offset * this->resize.step_height, 0, 0);
-									char buf[512];
-									seprintf(buf, lastof(buf), "  %s: ", info->name);
-									::DrawString(sr.left, sr.right, sr.top, buf, TC_BLACK);
-									seprintf(buf, lastof(buf), "%08x (%s)", value, niv->name);
-									::DrawString(sr.left + prefix_width, sr.right, sr.top, buf, TC_BLACK);
-								}
+							int offset = i - this->vscroll->GetPosition();
+							i++;
+							if (offset >= 0 && offset < this->vscroll->GetCapacity()) {
+								Rect sr = r.Shrink(WidgetDimensions::scaled.frametext).Shrink(0, offset * this->resize.step_height, 0, 0);
+								char buf[512];
+								seprintf(buf, lastof(buf), "  %s: ", name);
+								::DrawString(sr.left, sr.right, sr.top, buf, TC_BLACK);
+								seprintf(buf, lastof(buf), "%08x (%s)", value, niv->name);
+								::DrawString(sr.left + prefix_width, sr.right, sr.top, buf, TC_BLACK);
 							}
-							break;
 						}
 					}
 				} else {
diff --git a/src/newgrf_extension.cpp b/src/newgrf_extension.cpp
index 9311bade77..4f1c10a742 100644
--- a/src/newgrf_extension.cpp
+++ b/src/newgrf_extension.cpp
@@ -197,6 +197,13 @@ extern const GRFVariableMapDefinition _grf_action2_remappable_variables[] = {
 	GRFVariableMapDefinition(),
 };
 
+extern const GRFNameOnlyVariableMapDefinition _grf_action2_internal_variable_names[] = {
+	GRFNameOnlyVariableMapDefinition(A2VRI_VEHICLE_CURRENT_SPEED_SCALED, "current speed scaled"),
+	GRFNameOnlyVariableMapDefinition(A2VRI_STATION_INFO_NEARBY_TILES_EXT, "68 (extended)"),
+	GRFNameOnlyVariableMapDefinition(A2VRI_ROADSTOP_INFO_NEARBY_TILES_EXT, "68 (extended)"),
+	GRFNameOnlyVariableMapDefinition(),
+};
+
 /** Action14 Action5 remappable type list */
 extern const Action5TypeRemapDefinition _grf_action5_remappable_types[] = {
 	Action5TypeRemapDefinition("programmable_signals", A5BLOCK_ALLOW_OFFSET, SPR_PROGSIGNAL_BASE, 1, 32, "Programmable pre-signal graphics"),
diff --git a/src/newgrf_spritegroup.cpp b/src/newgrf_spritegroup.cpp
index 1868d3d35b..1dbf212b69 100644
--- a/src/newgrf_spritegroup.cpp
+++ b/src/newgrf_spritegroup.cpp
@@ -514,12 +514,9 @@ static char *DumpSpriteGroupAdjust(char *p, const char *last, const Deterministi
 	};
 
 	auto append_extended_var = [&](int var_id) {
-		extern const GRFVariableMapDefinition _grf_action2_remappable_variables[];
-		for (const GRFVariableMapDefinition *info = _grf_action2_remappable_variables; info->name != nullptr; info++) {
-			if (var_id == info->id) {
-				p += seprintf(p, last, " (%s)", info->name);
-				break;
-			}
+		const char *name = GetExtendedVariableNameById(var_id);
+		if (name != nullptr) {
+			p += seprintf(p, last, " (%s)", name);
 		}
 	};
 
@@ -560,9 +557,7 @@ static char *DumpSpriteGroupAdjust(char *p, const char *last, const Deterministi
 		highlight_tag = (2 << 16) | (adjust.and_mask & 0xFFFF);
 	}
 	p += seprintf(p, last, "var: %X", adjust.variable);
-	if (adjust.variable == A2VRI_VEHICLE_CURRENT_SPEED_SCALED) {
-		p += seprintf(p, last, " (current_speed_scaled)");
-	} else if (adjust.variable >= 0x100) {
+	if (adjust.variable >= 0x100) {
 		append_extended_var(adjust.variable);
 	}
 	if (adjust.variable == 0x7B && adjust.parameter >= 0x100) {