Technically speaking that is one "unit" of that "articulated" car (each unit shares a truck w/ adjacent units). And it's the "B" end of the car. If it's a five unit car the next wells to the left will be C, D, E then A. So all intermodal cars have A & B ends like all other freight cars. The intermediate units will all have the same car number w/ a letter following it usually on top center of the unit side. Wonder if this is a chopped down 48' well or a new design?