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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
Driving advice systems in main line operation		very promising
Driving advice systems in freight operation		promising
Double-layer capacitors (storage technology)		very promising
Double-decked stock		very promising
Diesel-mechanic transmission		promising
Diesel-electric vehicles with energy storage		promising
Diesel flow meters		interesting
Demixing of railway infrastructure		interesting
Database of traction consumption		promising
Covers for open freight cars		promising
Coupling of parked trains for common energy supply		interesting
Control of comfort functions in parked trains		very promising

© UIC - International Union of Railways 2003