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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
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
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

© UIC - International Union of Railways 2003