(svn r3906) Before removing a rail/setting the owner of a road to none check if there's a transport route at all under the bridge
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		@@ -1298,7 +1298,7 @@ static void ChangeTileOwner_TunnelBridge(TileIndex tile, PlayerID old_player, Pl
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	if (new_player != OWNER_SPECTATOR) {
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		SetTileOwner(tile, new_player);
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	}	else {
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		if ((_m[tile].m5 & 0xC0) == 0xC0) {
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		if ((_m[tile].m5 & 0xE0) == 0xE0) {
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			// the stuff BELOW the middle part is owned by the deleted player.
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			if (!(_m[tile].m5 & (1 << 4 | 1 << 3))) {
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				// convert railway into grass.
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