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Modern mass transit vehicles are capable of feeding up to 40 % of the energy generated in braking mode back into the power supply system.
This recovered energy can only be used if other vehicles operating on the line accelerate at the same time. However, this is a relatively seldom occurrence, especially on free-running line sections. Long considered to be an ecological as well as economic waste, this surplus energy can now be used thanks to energy storage systems.
Through the efficient use of braking energy, these energy storage systems help optimize the voltage stability and reduce the operating costs of rail-based systems.
 Voltage stabilization
Energy storage
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