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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
Streamlining of train sides and underfloor areas		interesting
Streamlining of head and tail		not promising
Stationary energy storage		promising
Speed harmonisation		not promising
Space Utilization
SOTRELE:Real Time Power and Energy Optimisation System
Smart windows		interesting
Single-axle bogies		very promising
Self-propelled freight cars		interesting
Sandwich structures		promising
Revision of limit value for longitudinal forces in the train		interesting
Regenerative braking in freight trains		interesting

© UIC - International Union of Railways 2003