(svn r23861) -Feature: [NewGRF] New algorithm (activated via an engine flag) to determine the capacity of vehicles. This allows vehicles to better control the capacity for cargotypes which they know; and let cargo NewGRFs influence the capacity for cargos the vehicle NewGRF does not know, but which the vehicle is refittable to due to cargo classes.

src/engine_type.h

@@ -156,6 +156,7 @@ enum EngineMiscFlags {
 	EF_RAIL_IS_MU = 2, ///< Rail vehicle is a multiple-unit (DMU/EMU)
 	EF_RAIL_FLIPS = 3, ///< Rail vehicle can be flipped in the depot
 	EF_AUTO_REFIT = 4, ///< Automatic refitting is allowed
+	EF_NO_DEFAULT_CARGO_MULTIPLIER = 5, ///< Use the new capacity algorithm. The default cargotype of the vehicle does not affect capacity multipliers. CB 15 is also called in purchase list.
 };
 
 /**