Dating from 1978, the 100 class 7E's were South Africa's first production 25kv ac locomotives, and were ordered following successful trials with a Class 6E1 testbed, no. E1600.
Classes 7E, 9E, 11E, 14E, 15E, 19E, 20E and 21E.
7E & 11E are 25kv AC locos. 9E & 15E are 50kv AC locos and the remainder are dual-voltage (25kv AC & 3kv DC).