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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
Ventilation control (in new stock)		very promising
Ventilation control (retrofit)		promising
Loss reduction by optimised power intake		interesting
Upgrading of engines		interesting
Future developments in diesel technology		promising
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

© UIC - International Union of Railways 2003