The Shift2Rail Joint Undertaking (S2R) has set impact targets for the future rail system. Those targets of the KPIs, calculated by comparing future KPIs in the year 2030 to baseline KPIs as of 2013, are defined in the Shift2Rail Master Plan. These include among others to double the capacity (+100%), half the life cycle costs (LCC) (-50%) and to increase punctuality by improving reliability by 50% [1]. In order to keep track of the realisation of these targets and to measure their degree of fulfilment a quantitative KPI model has been developed. The modelling approach and implementation are discussed in this contribution.