Bombardier's eco4 suite of solutions, services, products and technologies addresses the most pressing concerns facing rail transit operators today. It offers the latest state-of-the-art environmental technology by combining the four "e" cornerstones of sustainable mobility: energy, efficiency, economy and ecology. By this, the research and development focused on integrating a wide spectrum of performance requirements and operational needs. Because the result of this research is a modular suite of solutions, it offers specific benefits for the individual train operators. Implementing our eco4 technologies can create an overall energy saving of up to 50 per cent. Solutions range from planning energy efficiency of new transportation systems and new aerodynamically enhanced train designs to optimizing the energy consumption of an existing fleet.