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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
Multiple units (MUs) vs. loco-hauled trains		very promising
Medium-frequency transformer		very promising
HTSC transformer		very promising
IGBT		very promising
Switch-off of traction group		very promising
Ventilation control (in new stock)		very promising
Common Rail		very promising
Regenerative braking in 16,7 Hz, 15 kV systems		very promising
On-board use of braking energy in diesel-electric stock		very promising
Double-layer capacitors (storage technology)		very promising
Modification of target temperature in passenger coaches		very promising
CO2-based demand control for coach ventilation		very promising

© UIC - International Union of Railways 2003