There is an initial cost penalty, because the previous return conductor, insulated to a fairly modest voltage, must be replaced by an anti-phase feeder, insulated to 25 kV, and the autotransformers transformers themselves are larger and more expensive than the previous booster transformers.
2.
Note that booster transformers only " boost " the return of traction current through its intended path, the " return conductor ", rather than randomly through the earth, and do not boost, but rather reduce, the available voltage at the train, and introduce additional losses.
3.
In the UK Network Rail are using autotransformers on all new 50 Hz electrification, and ( as of 2014 ) are converting many old booster transformer installations to autotransformers, to reduce energy losses [ http : / / www . networkrail . co . uk / browse % 20documents / track % 20access / 2 % 20completed % 20consultations / 2010 / 2010.06.11 % 20west % 20coast % 20trains % 209th % 20sa % 20-% 20consultation % 20closed % 2007 % 20july % 202010 / ec4t % 20loss % 20report % 20v1.0 . pdf and exported electromagnetic interference, both of which increase when longer, heavier, or faster trains are introduced, drawing higher peak current from the supply.
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