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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
Common Rail		very promising
Biodiesel		not promising
Diesel-electric vehicles with energy storage		promising
Regenerative braking in 16,7 Hz, 15 kV systems		very promising
Radio-controlled double traction in freight trains		not promising
Regenerative braking in freight trains		interesting
On-board use of braking energy in diesel-electric stock		very promising
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

© UIC - International Union of Railways 2003