B unit
Class 16E electric locomotives were two-unit semi-permanently coupled Class 6E1 pairs coupled at their no. 1 ends. The aim was to accomplish savings on cab maintenance by abandoning the no. 1 end cabs in terms of maintenance and using only the no. 2 end cabs. During 1990 and 1991 Spoornet made up several such semi-permanently coupled pairs of otherwise unmodified Series 3 to Series 9 Class 6E1 locomotives, each pair getting reclassified to Class 16E, renumbered to a shared new unit number and with each unit inscribed as either the A or B unit.