(svn r21842) -Feature [FS#4393]: [NewGRF] Introduction dates/required types for rail types; e.g. introduce a particular rail type in 1960 (or when a vehicle using it is introduced), but also allow limiting its introduction to only happen when the required railtypes are available

src/table/railtypes.h

@@ -95,6 +95,12 @@ static const RailtypeInfo _original_railtypes[] = {
 		/* map colour */
 		0x0A,
 
+		/* introduction date */
+		INVALID_DATE,
+
+		/* railtypes required for this to be introduced */
+		RAILTYPES_NONE,
+
 		/* introduction rail types */
 		RAILTYPES_RAIL,
 
@@ -181,6 +187,12 @@ static const RailtypeInfo _original_railtypes[] = {
 		/* map colour */
 		0x0A,
 
+		/* introduction date */
+		INVALID_DATE,
+
+		/* railtypes required for this to be introduced */
+		RAILTYPES_NONE,
+
 		/* introduction rail types */
 		RAILTYPES_ELECTRIC,
 
@@ -263,6 +275,12 @@ static const RailtypeInfo _original_railtypes[] = {
 		/* map colour */
 		0x0A,
 
+		/* introduction date */
+		INVALID_DATE,
+
+		/* railtypes required for this to be introduced */
+		RAILTYPES_NONE,
+
 		/* introduction rail types */
 		RAILTYPES_MONO,
 
@@ -345,6 +363,12 @@ static const RailtypeInfo _original_railtypes[] = {
 		/* map colour */
 		0x0A,
 
+		/* introduction date */
+		INVALID_DATE,
+
+		/* railtypes required for this to be introduced */
+		RAILTYPES_NONE,
+
 		/* introduction rail types */
 		RAILTYPES_MAGLEV,