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Technology	evaluated	Overall Potential	-- show additional criterion -- Barriers Benefits (other than environmental) Energy efficiency (single vehicles) Status of development Technology field Vehicle - fix costs
Revision of limit value for longitudinal forces in the train		interesting
Inverter unit for DC substations		promising
On-board energy storage in DC systems		promising
Stationary energy storage		promising
Fly-wheels (storage technology)		promising
Batteries (storage technology)		interesting
Double-layer capacitors (storage technology)		very promising
Superconducting Magnetic Energy Storage (storage technology)		not promising
PEM fuel cell		interesting
Natural gas		interesting
Hydrogen engine		interesting
Gas turbine		interesting

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