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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 head and tail		not promising
Streamlining of train sides and underfloor areas		interesting
Bogie fairings		very promising
Aerodynamic ordering of freight cars		promising
Double-decked stock		very promising
Wide-body stock		very promising
Multiple units (MUs) vs. loco-hauled trains		very promising
Medium-frequency transformer		very promising
HTSC transformer		very promising
IGBT		very promising
Wheel-mounted permanent magnet synchronous motor		promising
Switch-off of traction group		very promising

© UIC - International Union of Railways 2003