Investments NS invested €791 million in 2016 (€536 million in 2015), mainly in trains for implementation of the HSL solution, New Generation intercity trains, New Generation Sprinter trains, Stadler FLIRT trains, the overhaul and modernisation of the VIRM1 and the installation of toilets in the Sprinter Light trains. NS made joint investments with ProRail in the stations of Amsterdam Centraal, Eindhoven and Breda, among others. Investments were also made in ICT systems for managing rolling stock and staff, and in customer systems such as the journey planner, which is aimed at improving the door-to-door journey for passengers.Capital base/total assetsAssets liabilitiesWorking capitalTotal assetsProfitability 20162015Relating to the capital position Capital base/total assets55%53%Current assets/current liabilities 0.90.9Working capital (in millions of euros) -810-522Total assets (in millions of euros) 6,3596,286Relating to profitability Result from operating activities/operating income (ROS) 5.3%3.4%Result from operating activities/average invested capital (ROI) 5.7%3.5%Profit for the period/average equity (ROE) 6.2%3.6%