Index: src/newgrf_config.cpp
===================================================================
--- src/newgrf_config.cpp	(Revision 25050)
+++ src/newgrf_config.cpp	(Arbeitskopie)
@@ -21,6 +21,7 @@
 #include "video/video_driver.hpp"
 #include "strings_func.h"
 #include "textfile_gui.h"
+#include "core/random_func.hpp"
 
 #include "fileio_func.h"
 #include "fios.h"
@@ -144,7 +145,17 @@
 
 	for (uint i = 0; i < this->param_info.Length(); i++) {
 		if (this->param_info[i] == NULL) continue;
-		this->param_info[i]->SetValue(this, this->param_info[i]->def_value);
+		if (this->param_info[i]->type == PTYPE_RANDOM) {
+			const uint32 start = this->param_info[i]->min_value;
+			const uint32 range = this->param_info[i]->max_value - this->param_info[i]->min_value + 1;
+			if (range != 0) {
+				this->param_info[i]->SetValue(this, _interactive_random.Next() % range + start);
+			} else {
+				this->param_info[i]->SetValue(this, _interactive_random.Next());
+			}
+		} else {
+			this->param_info[i]->SetValue(this, this->param_info[i]->def_value);
+		}
 	}
 }
 
Index: src/newgrf.cpp
===================================================================
--- src/newgrf.cpp	(Revision 25050)
+++ src/newgrf.cpp	(Arbeitskopie)
@@ -7290,6 +7290,7 @@
 		GRFParameterType type = (GRFParameterType)buf->ReadByte();
 		if (type < PTYPE_END) {
 			_cur_parameter->type = type;
+			if (type == PTYPE_RANDOM) _cur.grfconfig->has_param_defaults = true;
 		} else {
 			grfmsg(3, "StaticGRFInfo: unknown parameter type %d, ignoring this field", type);
 		}
@@ -7300,8 +7301,8 @@
 /** Callback function for 'INFO'->'PARAM'->param_num->'LIMI' to set the min/max value of a parameter. */
 static bool ChangeGRFParamLimits(size_t len, ByteReader *buf)
 {
-	if (_cur_parameter->type != PTYPE_UINT_ENUM) {
-		grfmsg(2, "StaticGRFInfo: 'INFO'->'PARA'->'LIMI' is only valid for parameters with type uint/enum, ignoring this field");
+	if (_cur_parameter->type != PTYPE_UINT_ENUM || _cur_parameter->type != PTYPE_RANDOM) {
+		grfmsg(2, "StaticGRFInfo: 'INFO'->'PARA'->'LIMI' is only valid for parameters with type uint/enum or random, ignoring this field");
 		buf->Skip(len);
 	} else if (len != 8) {
 		grfmsg(2, "StaticGRFInfo: expected 8 bytes for 'INFO'->'PARA'->'LIMI' but got " PRINTF_SIZE ", ignoring this field", len);
@@ -7340,6 +7341,9 @@
 	if (len != 4) {
 		grfmsg(2, "StaticGRFInfo: expected 4 bytes for 'INFO'->'PARA'->'DEFA' but got " PRINTF_SIZE ", ignoring this field", len);
 		buf->Skip(len);
+	} else if (_cur_parameter->type == PTYPE_RANDOM) {
+		grfmsg(2, "StaticGRFInfo: 'INFO'->'PARA'->'DEFA' is not valid for parameters with type random, ignoring this field");
+		buf->Skip(len);
 	} else {
 		_cur_parameter->def_value = buf->ReadDWord();
 	}
Index: src/newgrf_config.h
===================================================================
--- src/newgrf_config.h	(Revision 25050)
+++ src/newgrf_config.h	(Arbeitskopie)
@@ -115,6 +115,7 @@
 enum GRFParameterType {
 	PTYPE_UINT_ENUM, ///< The parameter allows a range of numbers, each of which can have a special name
 	PTYPE_BOOL,      ///< The parameter is either 0 or 1
+	PTYPE_RANDOM,    ///< The parameter is filled with random bits instead of set by the player
 	PTYPE_END,       ///< Invalid parameter type
 };