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<p>Yes, thank you for the correction.  What I had intended to say before my coffee was they use DPUs so that they can do all the switching going one direction or the other.  They usually run 3 units.  2 on the south end and 1 on north end on the southbound trip.  In the days before they scrapped the B-units, they ran with one cab facing each way.  They still run 3 units, and the north end unit faces north, but the second south unit may be found facing either direction.  It may depend if they are dropping a unit in Groton or not (as was the case this last Thursday).  The reasoning behind the placement of the north side engine is for the trip north without a run around.  I have also seen the second unit (or both) run around the train and put on the head end for the trip north. </p>
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