diff --git a/newgrf.c b/newgrf.c
--- a/newgrf.c
+++ b/newgrf.c
@@ -3305,6 +3305,31 @@ static void InitNewGRFFile(const GRFConf
 	}
 }
 
+
+/** Bitmasked values of what type of cargo is refittable for the given vehicle-type.
+ * This coupled with the landscape information (_landscape_global_cargo_mask) gives
+ * us exactly what is refittable and what is not */
+#define MC(cargo) (1 << cargo)
+static const uint32 _default_refitmasks[NUM_VEHICLE_TYPES] = {
+	/* Trains */
+	MC(GC_PASSENGERS) | MC(GC_COAL)      | MC(GC_MAIL)   | MC(GC_LIVESTOCK) | MC(GC_GOODS)        | MC(GC_GRAIN)      | MC(GC_WOOD)    | MC(GC_IRON_ORE)    |
+	MC(GC_STEEL)      | MC(GC_VALUABLES) | MC(GC_PAPER)  | MC(GC_FOOD)      | MC(GC_FRUIT)        | MC(GC_COPPER_ORE) | MC(GC_WATER)   | MC(GC_SUGAR)       |
+	MC(GC_TOYS)       | MC(GC_CANDY)     | MC(GC_TOFFEE) | MC(GC_COLA)      | MC(GC_COTTON_CANDY) | MC(GC_BUBBLES)    | MC(GC_PLASTIC) | MC(GC_FIZZY_DRINKS),
+	/* Road vehicles (not refittable by default) */
+	0,
+	/* Ships */
+	MC(GC_COAL)  | MC(GC_MAIL)   | MC(GC_LIVESTOCK) | MC(GC_GOODS)        | MC(GC_GRAIN)   | MC(GC_WOOD)    | MC(GC_IRON_ORE) | MC(GC_STEEL) | MC(GC_VALUABLES) |
+	MC(GC_PAPER) | MC(GC_FOOD)   | MC(GC_FRUIT)     | MC(GC_COPPER_ORE)   | MC(GC_WATER)   | MC(GC_RUBBER)  | MC(GC_SUGAR)    | MC(GC_TOYS)  | MC(GC_BATTERIES) |
+	MC(GC_CANDY) | MC(GC_TOFFEE) | MC(GC_COLA)      | MC(GC_COTTON_CANDY) | MC(GC_BUBBLES) | MC(GC_PLASTIC) | MC(GC_FIZZY_DRINKS),
+	/* Aircraft */
+	MC(GC_PASSENGERS) | MC(GC_MAIL)  | MC(GC_GOODS)  | MC(GC_VALUABLES) | MC(GC_FOOD)         | MC(GC_FRUIT)   | MC(GC_SUGAR)   | MC(GC_TOYS) |
+	MC(GC_BATTERIES)  | MC(GC_CANDY) | MC(GC_TOFFEE) | MC(GC_COLA)      | MC(GC_COTTON_CANDY) | MC(GC_BUBBLES) | MC(GC_PLASTIC) | MC(GC_FIZZY_DRINKS),
+	/* Special/Disaster */
+	0,0
+};
+#undef MC
+
+
 /**
  * Precalculate refit masks from cargo classes for all vehicles.
  */