diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 38ba2f104a..be29ccdd19 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -479,6 +479,7 @@ add_files(
     train.h
     train_cmd.cpp
     train_gui.cpp
+    train_speed_adaptation.h
     transparency.h
     transparency_gui.cpp
     transparency_gui.h
diff --git a/src/saveload/CMakeLists.txt b/src/saveload/CMakeLists.txt
index 0fb209b624..af8909fcde 100644
--- a/src/saveload/CMakeLists.txt
+++ b/src/saveload/CMakeLists.txt
@@ -48,6 +48,7 @@ add_files(
     tbtr_template_veh_sl.cpp
     town_sl.cpp
     tracerestrict_sl.cpp
+    train_speed_adaptation.cpp
     tunnel_sl.cpp
     vehicle_sl.cpp
     waypoint_sl.cpp
diff --git a/src/saveload/extended_ver_sl.cpp b/src/saveload/extended_ver_sl.cpp
index ec53a3fde9..4223b31974 100644
--- a/src/saveload/extended_ver_sl.cpp
+++ b/src/saveload/extended_ver_sl.cpp
@@ -151,6 +151,7 @@ const SlxiSubChunkInfo _sl_xv_sub_chunk_infos[] = {
 	{ XSLFI_WATER_FLOODING,         XSCF_NULL,                2,   2, "water_flooding",            nullptr, nullptr, nullptr        },
 	{ XSLFI_MORE_HOUSES,            XSCF_NULL,                2,   2, "more_houses",               nullptr, nullptr, nullptr        },
 	{ XSLFI_CUSTOM_TOWN_ZONE,       XSCF_IGNORABLE_UNKNOWN,   1,   1, "custom_town_zone",          nullptr, nullptr, nullptr        },
+	{ XSLFI_TRAIN_SPEED_ADAPTATION, XSCF_NULL,                1,   1, "train_speed_adaptation",    nullptr, nullptr, "TSAS"         },
 	{ XSLFI_NULL, XSCF_NULL, 0, 0, nullptr, nullptr, nullptr, nullptr },// This is the end marker
 };
 
diff --git a/src/saveload/extended_ver_sl.h b/src/saveload/extended_ver_sl.h
index 1cc9c89de1..b752241491 100644
--- a/src/saveload/extended_ver_sl.h
+++ b/src/saveload/extended_ver_sl.h
@@ -105,6 +105,7 @@ enum SlXvFeatureIndex {
 	XSLFI_WATER_FLOODING,                         ///< Water flooding map bit
 	XSLFI_MORE_HOUSES,                            ///< More house types
 	XSLFI_CUSTOM_TOWN_ZONE,                       ///< Custom town zones
+	XSLFI_TRAIN_SPEED_ADAPTATION,                 ///< Train speed adaptation
 
 	XSLFI_RIFF_HEADER_60_BIT,                     ///< Size field in RIFF chunk header is 60 bit
 	XSLFI_HEIGHT_8_BIT,                           ///< Map tile height is 8 bit instead of 4 bit, but savegame version may be before this became true in trunk
diff --git a/src/saveload/saveload.cpp b/src/saveload/saveload.cpp
index ef2d58280e..8feaae1486 100644
--- a/src/saveload/saveload.cpp
+++ b/src/saveload/saveload.cpp
@@ -288,6 +288,7 @@ extern const ChunkHandler _template_replacement_chunk_handlers[];
 extern const ChunkHandler _template_vehicle_chunk_handlers[];
 extern const ChunkHandler _bridge_signal_chunk_handlers[];
 extern const ChunkHandler _tunnel_chunk_handlers[];
+extern const ChunkHandler _train_speed_adaptation_chunk_handlers[];
 extern const ChunkHandler _debug_chunk_handlers[];
 
 /** Array of all chunks in a savegame, \c nullptr terminated. */
@@ -333,6 +334,7 @@ static const ChunkHandler * const _chunk_handlers[] = {
 	_template_vehicle_chunk_handlers,
 	_bridge_signal_chunk_handlers,
 	_tunnel_chunk_handlers,
+	_train_speed_adaptation_chunk_handlers,
 	_debug_chunk_handlers,
 	nullptr,
 };
diff --git a/src/saveload/vehicle_sl.cpp b/src/saveload/vehicle_sl.cpp
index 7583249a7b..c9d348bbef 100644
--- a/src/saveload/vehicle_sl.cpp
+++ b/src/saveload/vehicle_sl.cpp
@@ -807,6 +807,7 @@ const SaveLoad *GetVehicleDescription(VehicleType vt)
 		SLE_CONDNULL(11, SLV_2, SLV_144), // old reserved space
 		SLE_CONDVAR_X(Train, reverse_distance,    SLE_UINT16,         SL_MIN_VERSION, SL_MAX_VERSION, SlXvFeatureTest(XSLFTO_AND, XSLFI_REVERSE_AT_WAYPOINT)),
 		SLE_CONDVAR_X(Train, speed_restriction,   SLE_UINT16,         SL_MIN_VERSION, SL_MAX_VERSION, SlXvFeatureTest(XSLFTO_AND, XSLFI_SPEED_RESTRICTION)),
+		SLE_CONDVAR_X(Train, signal_speed_restriction, SLE_UINT16,    SL_MIN_VERSION, SL_MAX_VERSION, SlXvFeatureTest(XSLFTO_AND, XSLFI_TRAIN_SPEED_ADAPTATION)),
 		SLE_CONDVAR_X(Train, critical_breakdown_count, SLE_UINT8,     SL_MIN_VERSION, SL_MAX_VERSION, SlXvFeatureTest(XSLFTO_AND, XSLFI_IMPROVED_BREAKDOWNS, 2)),
 
 		     SLE_END()