Posted by Rangachari Anand on October 11, 2011 
Does "1+1+1+1" mean that the helpers are scattered throughout the length of the train?
Posted by Joseph Belote on October 16, 2011 
Rangachari: Basically, yes. It means there are three locomotives operating as distributed power throughout the train, likely two of them placed mid-train and a fourth on the rear.
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