anyone know the reasoning behind having both engines running up front back to back instead of one at each end of the train. on the 26th of march 353 and both locos up front and online. on the 27th 350 had the same 2 engines up front front and as 351 passed by it also had 2 engines up front. is this the new norm? why the switch from one at each end of the train to having them both up front?