In several recent rolling stock projects Dutch NS Reizigers decided to create an incentive for suppliers to reduce weight of supplied stock. An agreement was made with manufacturers fixing maximum weight as well as a bonus/penalty for each kg of weight reduction/increase beyond that target value. The amount of the bonus is based on the energy cost benefits NS Reizigers realises as a consequence of the weight reduction.
The bonus/penalty system is already applied in the purchasing of new Regiorunners as well retrofit measures on the Sprinter and Regiorunner trains.