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Text 3 In recent years, railroads have been combining with each other, merging into super systems...

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Rai1期,BinetA期  Rai1期,BinetB期  Rai0期,BinetA期  Rai0期,BinetB期  Rai3期,BinetC期  
M3RSI  M3ASC  M3RAI  IHASC  
RAI=MCC+MNC+LAC;  RAI=MCC+MNC+LAI;  RAI=MCC+MNC+RAC;  RAI=MCC+MNC+LAC+RAC。  
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taken up    taken on    taken in    taken off  

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