diff --git a/src/saveload/extended_ver_sl.cpp b/src/saveload/extended_ver_sl.cpp
index 7127faf7b6..e2cc066cec 100644
--- a/src/saveload/extended_ver_sl.cpp
+++ b/src/saveload/extended_ver_sl.cpp
@@ -45,6 +45,7 @@ std::vector<uint32> _sl_xv_discardable_chunk_ids;           ///< list of chunks
 static const uint32 _sl_xv_slxi_chunk_version = 0;          ///< current version os SLXI chunk
 
 const SlxiSubChunkInfo _sl_xv_sub_chunk_infos[] = {
+	{ XSLFI_SIG_TUNNEL_BRIDGE, XSCF_NULL, 1, 1, "signal_tunnel_bridge", NULL, NULL, NULL },
 	{ XSLFI_NULL, XSCF_NULL, 0, 0, NULL, NULL, NULL, NULL },// This is the end marker
 };
 
diff --git a/src/saveload/extended_ver_sl.h b/src/saveload/extended_ver_sl.h
index a7e9496944..c0804337f8 100644
--- a/src/saveload/extended_ver_sl.h
+++ b/src/saveload/extended_ver_sl.h
@@ -21,6 +21,7 @@
  */
 enum SlXvFeatureIndex {
 	XSLFI_NULL                          = 0,      ///< Unused value, to indicate that no extended feature test is in use
+	XSLFI_SIG_TUNNEL_BRIDGE,                      ///< Signals on tunnels and bridges
 
 	XSLFI_SIZE,                                   ///< Total count of features, including null feature
 };
diff --git a/src/table/settings.ini b/src/table/settings.ini
index 4185bf7b10..f814c3f54c 100644
--- a/src/table/settings.ini
+++ b/src/table/settings.ini
@@ -556,6 +556,7 @@ strval   = STR_CONFIG_SETTING_SIMULATE_SIGNALS_VALUE
 proc     = RedrawScreen
 from     = 0
 cat      = SC_BASIC
+patxname = ""signal_tunnel_bridge.construction.simulated_wormhole_signals""
 
 # construction.longbridges
 [SDT_NULL]