diff --git a/src/saveload/ai_sl.cpp b/src/saveload/ai_sl.cpp
--- a/src/saveload/ai_sl.cpp
+++ b/src/saveload/ai_sl.cpp
@@ -121,7 +121,7 @@ static void Save_AIPL()
 }
 
 extern const ChunkHandler _ai_chunk_handlers[] = {
-	{ 'AIPL', Save_AIPL, Load_AIPL, NULL, CH_ARRAY | CH_LAST},
+	{ 'AIPL', Save_AIPL, Load_AIPL, NULL, NULL, CH_ARRAY | CH_LAST},
 };
 #else
 
@@ -197,6 +197,6 @@ static void Load_AIPL()
 }
 
 extern const ChunkHandler _ai_chunk_handlers[] = {
-	{ 'AIPL', NULL, Load_AIPL, NULL, CH_ARRAY | CH_LAST},
+	{ 'AIPL', NULL, Load_AIPL, NULL, NULL, CH_ARRAY | CH_LAST},
 };
 #endif /* ENABLE_AI */
diff --git a/src/saveload/airport_sl.cpp b/src/saveload/airport_sl.cpp
--- a/src/saveload/airport_sl.cpp
+++ b/src/saveload/airport_sl.cpp
@@ -50,5 +50,5 @@ static void Load_APID()
 }
 
 extern const ChunkHandler _airport_chunk_handlers[] = {
-	{ 'APID', Save_APID, Load_APID, NULL, CH_ARRAY | CH_LAST },
+	{ 'APID', Save_APID, Load_APID, NULL, NULL, CH_ARRAY | CH_LAST },
 };
diff --git a/src/saveload/animated_tile_sl.cpp b/src/saveload/animated_tile_sl.cpp
--- a/src/saveload/animated_tile_sl.cpp
+++ b/src/saveload/animated_tile_sl.cpp
@@ -59,5 +59,5 @@ static void Load_ANIT()
  * the animated tile table.
  */
 extern const ChunkHandler _animated_tile_chunk_handlers[] = {
-	{ 'ANIT', Save_ANIT, Load_ANIT, NULL, CH_RIFF | CH_LAST},
+	{ 'ANIT', Save_ANIT, Load_ANIT, NULL, NULL, CH_RIFF | CH_LAST},
 };
diff --git a/src/saveload/autoreplace_sl.cpp b/src/saveload/autoreplace_sl.cpp
--- a/src/saveload/autoreplace_sl.cpp
+++ b/src/saveload/autoreplace_sl.cpp
@@ -60,5 +60,5 @@ static void Ptrs_ERNW()
 }
 
 extern const ChunkHandler _autoreplace_chunk_handlers[] = {
-	{ 'ERNW', Save_ERNW, Load_ERNW, Ptrs_ERNW, CH_ARRAY | CH_LAST},
+	{ 'ERNW', Save_ERNW, Load_ERNW, Ptrs_ERNW, NULL, CH_ARRAY | CH_LAST},
 };
diff --git a/src/saveload/cargopacket_sl.cpp b/src/saveload/cargopacket_sl.cpp
--- a/src/saveload/cargopacket_sl.cpp
+++ b/src/saveload/cargopacket_sl.cpp
@@ -122,5 +122,5 @@ static void Load_CAPA()
 }
 
 extern const ChunkHandler _cargopacket_chunk_handlers[] = {
-	{ 'CAPA', Save_CAPA, Load_CAPA, NULL, CH_ARRAY | CH_LAST},
+	{ 'CAPA', Save_CAPA, Load_CAPA, NULL, NULL, CH_ARRAY | CH_LAST},
 };
diff --git a/src/saveload/cheat_sl.cpp b/src/saveload/cheat_sl.cpp
--- a/src/saveload/cheat_sl.cpp
+++ b/src/saveload/cheat_sl.cpp
@@ -40,5 +40,5 @@ static void Load_CHTS()
 }
 
 extern const ChunkHandler _cheat_chunk_handlers[] = {
-	{ 'CHTS', Save_CHTS, Load_CHTS, NULL, CH_RIFF | CH_LAST},
+	{ 'CHTS', Save_CHTS, Load_CHTS, NULL, NULL, CH_RIFF | CH_LAST},
 };
diff --git a/src/saveload/company_sl.cpp b/src/saveload/company_sl.cpp
--- a/src/saveload/company_sl.cpp
+++ b/src/saveload/company_sl.cpp
@@ -300,5 +300,5 @@ static void Ptrs_PLYR()
 
 
 extern const ChunkHandler _company_chunk_handlers[] = {
-	{ 'PLYR', Save_PLYR, Load_PLYR, Ptrs_PLYR, CH_ARRAY | CH_LAST},
+	{ 'PLYR', Save_PLYR, Load_PLYR, Ptrs_PLYR, NULL, CH_ARRAY | CH_LAST},
 };
diff --git a/src/saveload/depot_sl.cpp b/src/saveload/depot_sl.cpp
--- a/src/saveload/depot_sl.cpp
+++ b/src/saveload/depot_sl.cpp
@@ -61,5 +61,5 @@ static void Ptrs_DEPT()
 }
 
 extern const ChunkHandler _depot_chunk_handlers[] = {
-	{ 'DEPT', Save_DEPT, Load_DEPT, Ptrs_DEPT, CH_ARRAY | CH_LAST},
+	{ 'DEPT', Save_DEPT, Load_DEPT, Ptrs_DEPT, NULL, CH_ARRAY | CH_LAST},
 };
diff --git a/src/saveload/economy_sl.cpp b/src/saveload/economy_sl.cpp
--- a/src/saveload/economy_sl.cpp
+++ b/src/saveload/economy_sl.cpp
@@ -99,8 +99,8 @@ static void Ptrs_CAPY()
 
 
 extern const ChunkHandler _economy_chunk_handlers[] = {
-	{ 'CAPY', Save_CAPY,     Load_CAPY,     Ptrs_CAPY, CH_ARRAY},
-	{ 'PRIC', NULL,          Load_PRIC,     NULL,      CH_RIFF | CH_AUTO_LENGTH},
-	{ 'CAPR', NULL,          Load_CAPR,     NULL,      CH_RIFF | CH_AUTO_LENGTH},
-	{ 'ECMY', Save_ECMY,     Load_ECMY,     NULL,      CH_RIFF | CH_LAST},
+	{ 'CAPY', Save_CAPY,     Load_CAPY,     Ptrs_CAPY, NULL, CH_ARRAY},
+	{ 'PRIC', NULL,          Load_PRIC,     NULL,      NULL, CH_RIFF | CH_AUTO_LENGTH},
+	{ 'CAPR', NULL,          Load_CAPR,     NULL,      NULL, CH_RIFF | CH_AUTO_LENGTH},
+	{ 'ECMY', Save_ECMY,     Load_ECMY,     NULL,      NULL, CH_RIFF | CH_LAST},
 };
diff --git a/src/saveload/engine_sl.cpp b/src/saveload/engine_sl.cpp
--- a/src/saveload/engine_sl.cpp
+++ b/src/saveload/engine_sl.cpp
@@ -149,7 +149,7 @@ static void Load_EIDS()
 }
 
 extern const ChunkHandler _engine_chunk_handlers[] = {
-	{ 'EIDS', Save_EIDS, Load_EIDS, NULL, CH_ARRAY          },
-	{ 'ENGN', Save_ENGN, Load_ENGN, NULL, CH_ARRAY          },
-	{ 'ENGS', NULL,      Load_ENGS, NULL, CH_RIFF | CH_LAST },
+	{ 'EIDS', Save_EIDS, Load_EIDS, NULL, NULL, CH_ARRAY          },
+	{ 'ENGN', Save_ENGN, Load_ENGN, NULL, NULL, CH_ARRAY          },
+	{ 'ENGS', NULL,      Load_ENGS, NULL, NULL, CH_RIFF | CH_LAST },
 };
diff --git a/src/saveload/gamelog_sl.cpp b/src/saveload/gamelog_sl.cpp
--- a/src/saveload/gamelog_sl.cpp
+++ b/src/saveload/gamelog_sl.cpp
@@ -168,5 +168,5 @@ static void Save_GLOG()
 
 
 extern const ChunkHandler _gamelog_chunk_handlers[] = {
-	{ 'GLOG', Save_GLOG, Load_GLOG, NULL, CH_RIFF | CH_LAST }
+	{ 'GLOG', Save_GLOG, Load_GLOG, NULL, NULL, CH_RIFF | CH_LAST }
 };
diff --git a/src/saveload/group_sl.cpp b/src/saveload/group_sl.cpp
--- a/src/saveload/group_sl.cpp
+++ b/src/saveload/group_sl.cpp
@@ -46,5 +46,5 @@ static void Load_GRPS()
 }
 
 extern const ChunkHandler _group_chunk_handlers[] = {
-	{ 'GRPS', Save_GRPS, Load_GRPS, NULL, CH_ARRAY | CH_LAST},
+	{ 'GRPS', Save_GRPS, Load_GRPS, NULL, NULL, CH_ARRAY | CH_LAST},
 };
diff --git a/src/saveload/industry_sl.cpp b/src/saveload/industry_sl.cpp
--- a/src/saveload/industry_sl.cpp
+++ b/src/saveload/industry_sl.cpp
@@ -162,7 +162,7 @@ static void Ptrs_INDY()
 }
 
 extern const ChunkHandler _industry_chunk_handlers[] = {
-	{ 'INDY', Save_INDY, Load_INDY, Ptrs_INDY, CH_ARRAY},
-	{ 'IIDS', Save_IIDS, Load_IIDS,      NULL, CH_ARRAY},
-	{ 'TIDS', Save_TIDS, Load_TIDS,      NULL, CH_ARRAY | CH_LAST},
+	{ 'INDY', Save_INDY, Load_INDY, Ptrs_INDY, NULL, CH_ARRAY},
+	{ 'IIDS', Save_IIDS, Load_IIDS,      NULL, NULL, CH_ARRAY},
+	{ 'TIDS', Save_TIDS, Load_TIDS,      NULL, NULL, CH_ARRAY | CH_LAST},
 };
diff --git a/src/saveload/labelmaps_sl.cpp b/src/saveload/labelmaps_sl.cpp
--- a/src/saveload/labelmaps_sl.cpp
+++ b/src/saveload/labelmaps_sl.cpp
@@ -118,6 +118,6 @@ static void Load_RAIL()
 }
 
 extern const ChunkHandler _labelmaps_chunk_handlers[] = {
-	{ 'RAIL', Save_RAIL, Load_RAIL, NULL, CH_ARRAY | CH_LAST},
+	{ 'RAIL', Save_RAIL, Load_RAIL, NULL, NULL, CH_ARRAY | CH_LAST},
 };
 
diff --git a/src/saveload/map_sl.cpp b/src/saveload/map_sl.cpp
--- a/src/saveload/map_sl.cpp
+++ b/src/saveload/map_sl.cpp
@@ -241,13 +241,13 @@ static void Save_MAP7()
 }
 
 extern const ChunkHandler _map_chunk_handlers[] = {
-	{ 'MAPS', Save_MAPS, Load_MAPS, NULL, CH_RIFF },
-	{ 'MAPT', Save_MAPT, Load_MAPT, NULL, CH_RIFF },
-	{ 'MAPO', Save_MAP1, Load_MAP1, NULL, CH_RIFF },
-	{ 'MAP2', Save_MAP2, Load_MAP2, NULL, CH_RIFF },
-	{ 'M3LO', Save_MAP3, Load_MAP3, NULL, CH_RIFF },
-	{ 'M3HI', Save_MAP4, Load_MAP4, NULL, CH_RIFF },
-	{ 'MAP5', Save_MAP5, Load_MAP5, NULL, CH_RIFF },
-	{ 'MAPE', Save_MAP6, Load_MAP6, NULL, CH_RIFF },
-	{ 'MAP7', Save_MAP7, Load_MAP7, NULL, CH_RIFF | CH_LAST },
+	{ 'MAPS', Save_MAPS, Load_MAPS, NULL, NULL, CH_RIFF },
+	{ 'MAPT', Save_MAPT, Load_MAPT, NULL, NULL, CH_RIFF },
+	{ 'MAPO', Save_MAP1, Load_MAP1, NULL, NULL, CH_RIFF },
+	{ 'MAP2', Save_MAP2, Load_MAP2, NULL, NULL, CH_RIFF },
+	{ 'M3LO', Save_MAP3, Load_MAP3, NULL, NULL, CH_RIFF },
+	{ 'M3HI', Save_MAP4, Load_MAP4, NULL, NULL, CH_RIFF },
+	{ 'MAP5', Save_MAP5, Load_MAP5, NULL, NULL, CH_RIFF },
+	{ 'MAPE', Save_MAP6, Load_MAP6, NULL, NULL, CH_RIFF },
+	{ 'MAP7', Save_MAP7, Load_MAP7, NULL, NULL, CH_RIFF | CH_LAST },
 };
diff --git a/src/saveload/misc_sl.cpp b/src/saveload/misc_sl.cpp
--- a/src/saveload/misc_sl.cpp
+++ b/src/saveload/misc_sl.cpp
@@ -109,6 +109,6 @@ static void SaveLoad_VIEW()
 }
 
 extern const ChunkHandler _misc_chunk_handlers[] = {
-	{ 'DATE', SaveLoad_DATE, SaveLoad_DATE, NULL, CH_RIFF},
-	{ 'VIEW', SaveLoad_VIEW, SaveLoad_VIEW, NULL, CH_RIFF | CH_LAST},
+	{ 'DATE', SaveLoad_DATE, SaveLoad_DATE, NULL, NULL, CH_RIFF},
+	{ 'VIEW', SaveLoad_VIEW, SaveLoad_VIEW, NULL, NULL, CH_RIFF | CH_LAST},
 };
diff --git a/src/saveload/newgrf_sl.cpp b/src/saveload/newgrf_sl.cpp
--- a/src/saveload/newgrf_sl.cpp
+++ b/src/saveload/newgrf_sl.cpp
@@ -55,5 +55,5 @@ static void Load_NGRF()
 }
 
 extern const ChunkHandler _newgrf_chunk_handlers[] = {
-	{ 'NGRF', Save_NGRF, Load_NGRF, NULL, CH_ARRAY | CH_LAST }
+	{ 'NGRF', Save_NGRF, Load_NGRF, NULL, NULL, CH_ARRAY | CH_LAST }
 };
diff --git a/src/saveload/order_sl.cpp b/src/saveload/order_sl.cpp
--- a/src/saveload/order_sl.cpp
+++ b/src/saveload/order_sl.cpp
@@ -234,6 +234,6 @@ static void Ptrs_ORDL()
 }
 
 extern const ChunkHandler _order_chunk_handlers[] = {
-	{ 'ORDR', Save_ORDR, Load_ORDR, Ptrs_ORDR, CH_ARRAY},
-	{ 'ORDL', Save_ORDL, Load_ORDL, Ptrs_ORDL, CH_ARRAY | CH_LAST},
+	{ 'ORDR', Save_ORDR, Load_ORDR, Ptrs_ORDR, NULL, CH_ARRAY},
+	{ 'ORDL', Save_ORDL, Load_ORDL, Ptrs_ORDL, NULL, CH_ARRAY | CH_LAST},
 };
diff --git a/src/saveload/saveload.h b/src/saveload/saveload.h
--- a/src/saveload/saveload.h
+++ b/src/saveload/saveload.h
@@ -60,6 +60,7 @@ struct ChunkHandler {
 	ChunkSaveLoadProc *save_proc;
 	ChunkSaveLoadProc *load_proc;
 	ChunkSaveLoadProc *ptrs_proc;
+	ChunkSaveLoadProc *load_check_proc;
 	uint32 flags;
 };
 
diff --git a/src/saveload/signs_sl.cpp b/src/saveload/signs_sl.cpp
--- a/src/saveload/signs_sl.cpp
+++ b/src/saveload/signs_sl.cpp
@@ -57,5 +57,5 @@ static void Load_SIGN()
 }
 
 extern const ChunkHandler _sign_chunk_handlers[] = {
-	{ 'SIGN', Save_SIGN, Load_SIGN, NULL, CH_ARRAY | CH_LAST},
+	{ 'SIGN', Save_SIGN, Load_SIGN, NULL, NULL, CH_ARRAY | CH_LAST},
 };
diff --git a/src/saveload/station_sl.cpp b/src/saveload/station_sl.cpp
--- a/src/saveload/station_sl.cpp
+++ b/src/saveload/station_sl.cpp
@@ -475,7 +475,7 @@ static void Ptrs_ROADSTOP()
 }
 
 extern const ChunkHandler _station_chunk_handlers[] = {
-	{ 'STNS', NULL,          Load_STNS,     Ptrs_STNS,     CH_ARRAY },
-	{ 'STNN', Save_STNN,     Load_STNN,     Ptrs_STNN,     CH_ARRAY },
-	{ 'ROAD', Save_ROADSTOP, Load_ROADSTOP, Ptrs_ROADSTOP, CH_ARRAY | CH_LAST},
+	{ 'STNS', NULL,          Load_STNS,     Ptrs_STNS,     NULL, CH_ARRAY },
+	{ 'STNN', Save_STNN,     Load_STNN,     Ptrs_STNN,     NULL, CH_ARRAY },
+	{ 'ROAD', Save_ROADSTOP, Load_ROADSTOP, Ptrs_ROADSTOP, NULL, CH_ARRAY | CH_LAST},
 };
diff --git a/src/saveload/strings_sl.cpp b/src/saveload/strings_sl.cpp
--- a/src/saveload/strings_sl.cpp
+++ b/src/saveload/strings_sl.cpp
@@ -125,5 +125,5 @@ static void Load_NAME()
 }
 
 extern const ChunkHandler _name_chunk_handlers[] = {
-	{ 'NAME', NULL, Load_NAME, NULL, CH_ARRAY | CH_LAST},
+	{ 'NAME', NULL, Load_NAME, NULL, NULL, CH_ARRAY | CH_LAST},
 };
diff --git a/src/saveload/subsidy_sl.cpp b/src/saveload/subsidy_sl.cpp
--- a/src/saveload/subsidy_sl.cpp
+++ b/src/saveload/subsidy_sl.cpp
@@ -46,5 +46,5 @@ static void Load_SUBS()
 }
 
 extern const ChunkHandler _subsidy_chunk_handlers[] = {
-	{ 'SUBS', Save_SUBS, Load_SUBS, NULL, CH_ARRAY | CH_LAST},
+	{ 'SUBS', Save_SUBS, Load_SUBS, NULL, NULL, CH_ARRAY | CH_LAST},
 };
diff --git a/src/saveload/town_sl.cpp b/src/saveload/town_sl.cpp
--- a/src/saveload/town_sl.cpp
+++ b/src/saveload/town_sl.cpp
@@ -192,6 +192,6 @@ static void Load_TOWN()
 }
 
 extern const ChunkHandler _town_chunk_handlers[] = {
-	{ 'HIDS', Save_HOUSEIDS, Load_HOUSEIDS, NULL, CH_ARRAY },
-	{ 'CITY', Save_TOWN,     Load_TOWN,     NULL, CH_ARRAY | CH_LAST},
+	{ 'HIDS', Save_HOUSEIDS, Load_HOUSEIDS, NULL, NULL, CH_ARRAY },
+	{ 'CITY', Save_TOWN,     Load_TOWN,     NULL, NULL, CH_ARRAY | CH_LAST},
 };
diff --git a/src/saveload/vehicle_sl.cpp b/src/saveload/vehicle_sl.cpp
--- a/src/saveload/vehicle_sl.cpp
+++ b/src/saveload/vehicle_sl.cpp
@@ -757,5 +757,5 @@ static void Ptrs_VEHS()
 }
 
 extern const ChunkHandler _veh_chunk_handlers[] = {
-	{ 'VEHS', Save_VEHS, Load_VEHS, Ptrs_VEHS, CH_SPARSE_ARRAY | CH_LAST},
+	{ 'VEHS', Save_VEHS, Load_VEHS, Ptrs_VEHS, NULL, CH_SPARSE_ARRAY | CH_LAST},
 };
diff --git a/src/saveload/waypoint_sl.cpp b/src/saveload/waypoint_sl.cpp
--- a/src/saveload/waypoint_sl.cpp
+++ b/src/saveload/waypoint_sl.cpp
@@ -199,5 +199,5 @@ static void Ptrs_WAYP()
 }
 
 extern const ChunkHandler _waypoint_chunk_handlers[] = {
-	{ 'CHKP', NULL, Load_WAYP, Ptrs_WAYP, CH_ARRAY | CH_LAST},
+	{ 'CHKP', NULL, Load_WAYP, Ptrs_WAYP, NULL, CH_ARRAY | CH_LAST},
 };
diff --git a/src/settings.cpp b/src/settings.cpp
--- a/src/settings.cpp
+++ b/src/settings.cpp
@@ -1985,8 +1985,8 @@ void CheckConfig()
 }
 
 extern const ChunkHandler _setting_chunk_handlers[] = {
-	{ 'OPTS', NULL,      Load_OPTS, NULL, CH_RIFF},
-	{ 'PATS', Save_PATS, Load_PATS, NULL, CH_RIFF | CH_LAST},
+	{ 'OPTS', NULL,      Load_OPTS, NULL, NULL, CH_RIFF},
+	{ 'PATS', Save_PATS, Load_PATS, NULL, NULL, CH_RIFF | CH_LAST},
 };
 
 static bool IsSignedVarMemType(VarType vt)