diff --git a/src/table/newgrf_debug_data.h b/src/table/newgrf_debug_data.h
--- a/src/table/newgrf_debug_data.h
+++ b/src/table/newgrf_debug_data.h
@@ -398,7 +398,14 @@ class NIHRailType : public NIHelper {
 	const void *GetSpec(uint index) const                { return NULL; }
 	void SetStringParameters(uint index) const           { this->SetObjectAtStringParameters(STR_NEWGRF_INSPECT_CAPTION_OBJECT_AT_RAIL_TYPE, INVALID_STRING_ID, index); }
 	uint32 GetGRFID(uint index) const                    { return 0; }
-	void Resolve(ResolverObject *ro, uint32 index) const { extern void GetRailTypeResolver(ResolverObject *ro, uint index); GetRailTypeResolver(ro, index); }
+
+	/* virtual */ uint Resolve(uint index, uint var, uint param, bool *avail) const
+	{
+		/* There is no unique GRFFile for the tile. Multiple GRFs can define different parts of the railtype.
+		 * However, currently the NewGRF Debug GUI does not display variables depending on the GRF (like 0x7F) anyway. */
+		RailTypeResolverObject ro(index, TCX_NORMAL, NULL);
+		return ro.GetScope(ro.scope)->GetVariable(var, param, avail);
+	}
 };
 
 static const NIFeature _nif_railtype = {