Note the different paint profiles of the two Erode locos. 18491 has absolutely the same old livery of Erode locos before introduction of the new colour scheme, like the old type border around the road number, shape of whiskers etc. The second loco, 17710 has the old colours but new scheme. It does not have the border, it has new type of whiskers etc. 18491 used to be "Fit for goods only" till sometime back. It no more carries the clause on it.