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I think a lot also has to do with when there is engineering work and diversions take place - for a company to just have say eletric trains wouldnt makes sence because you then have no flexibility to divert trains onto routes which would require desiel traction. An electro desiel unit would be perfect which is what the government want HST2 to be. take for example Kings Cross - Inverness or Euston - Holyhead just 2 of many routes which could benefit from dual fuel traction.
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