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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
Aerodynamic optimisation of pantographs		interesting
Streamlining of train sides and underfloor areas		interesting
Loss reduction by optimised power intake		interesting
Upgrading of engines		interesting
Regenerative braking in freight trains		interesting
Revision of limit value for longitudinal forces in the train		interesting
Batteries (storage technology)		interesting
PEM fuel cell		interesting
Natural gas		interesting
Hydrogen engine		interesting
Gas turbine		interesting
Swissmetro		interesting

© UIC - International Union of Railways 2003