diff --git a/src/rail_cmd.cpp b/src/rail_cmd.cpp
--- a/src/rail_cmd.cpp
+++ b/src/rail_cmd.cpp
@@ -418,7 +418,7 @@ CommandCost CmdBuildSingleRail(TileIndex
 
 	if (flags & DC_EXEC) {
 		MarkTileDirtyByTile(tile);
-		SetSignalsOnBothDir(tile, track);
+		SetSignalsOnBothDir(tile, track, _current_player);
 		YapfNotifyTrackLayoutChange(tile, track);
 	}
 
@@ -441,6 +441,10 @@ CommandCost CmdRemoveSingleRail(TileInde
 	if (!ValParamTrackOrientation((Track)p2)) return CMD_ERROR;
 	trackbit = TrackToTrackBits(track);
 
+	/* Need to read tile owner now because it may change when the rail is removed.
+	 * Also, in case of floods, _current_player != owner */
+	Owner owner = GetTileOwner(tile);
+
 	switch (GetTileType(tile)) {
 		case MP_ROAD: {
 			if (!IsLevelCrossing(tile) ||
@@ -498,12 +502,12 @@ CommandCost CmdRemoveSingleRail(TileInde
 			 * are removing one of these pieces, we'll need to update signals for
 			 * both directions explicitly, as after the track is removed it won't
 			 * 'connect' with the other piece. */
-			SetSignalsOnBothDir(tile, TRACK_X);
-			SetSignalsOnBothDir(tile, TRACK_Y);
+			SetSignalsOnBothDir(tile, TRACK_X, owner);
+			SetSignalsOnBothDir(tile, TRACK_Y, owner);
 			YapfNotifyTrackLayoutChange(tile, TRACK_X);
 			YapfNotifyTrackLayoutChange(tile, TRACK_Y);
 		} else {
-			SetSignalsOnBothDir(tile, track);
+			SetSignalsOnBothDir(tile, track, owner);
 			YapfNotifyTrackLayoutChange(tile, track);
 		}
 	}
@@ -741,7 +745,7 @@ CommandCost CmdBuildTrainDepot(TileIndex
 
 		d->town_index = ClosestTownFromTile(tile, (uint)-1)->index;
 
-		UpdateSignalsOnSegment(tile, INVALID_DIAGDIR);
+		UpdateSignalsOnSegment(tile, INVALID_DIAGDIR, _current_player);
 		YapfNotifyTrackLayoutChange(tile, TrackdirToTrack(DiagdirToDiagTrackdir(dir)));
 		d_auto_delete.Detach();
 	}
@@ -867,7 +871,7 @@ CommandCost CmdBuildSingleSignal(TileInd
 		}
 
 		MarkTileDirtyByTile(tile);
-		SetSignalsOnBothDir(tile, track);
+		SetSignalsOnBothDir(tile, track, _current_player);
 		YapfNotifyTrackLayoutChange(tile, track);
 	}
 
@@ -1098,7 +1102,7 @@ CommandCost CmdRemoveSingleSignal(TileIn
 			SetSignalVariant(tile, INVALID_TRACK, SIG_ELECTRIC); // remove any possible semaphores
 		}
 
-		SetSignalsOnBothDir(tile, track);
+		SetSignalsOnBothDir(tile, track, GetTileOwner(tile));
 		YapfNotifyTrackLayoutChange(tile, track);
 
 		MarkTileDirtyByTile(tile);
@@ -1304,11 +1308,13 @@ static CommandCost RemoveTrainDepot(Tile
 		return CMD_ERROR;
 
 	if (flags & DC_EXEC) {
+		/* read variables before the depot is removed */
 		DiagDirection dir = GetRailDepotDirection(tile);
+		Owner owner = GetTileOwner(tile);
 
 		DoClearSquare(tile);
 		delete GetDepotByTile(tile);
-		UpdateSignalsOnSegment(tile, dir);
+		UpdateSignalsOnSegment(tile, dir, owner);
 		YapfNotifyTrackLayoutChange(tile, TrackdirToTrack(DiagdirToDiagTrackdir(dir)));
 	}