The ex Iscor Class , however, were equipped with additional removable running board-mounted handrails. Since these handrails are slide-fit into brackets welded onto the running boards, they are easily removed. Since c. 2009, other mainline diesel-electric locomotive types also emerged from the Koedoespoort Transwerk shops with running board-mounted handrails after major overhauls. At some stage during the mid-1980s, all Class , and locomotives had saddle filters installed across the long hood, mounted just to the rear of the screens behind the cab on the sides. Since then, Class locomotives could be distinguished from the older models by the absence of the saddle filter. Electronic control system Beginning in 2010, some locomotives were equipped with electronic fuel injection and GE "Bright Star" control systems. On some of the first locomotives to be so modified, externally visible evidence of the modification is a raised middle portion of the long hood. Service Changes in ownership In 1977, all mainline rail operations on the Sishen-Saldanha iron ore line was taken over from Iscor by the South African Railways (SAR). Between November 1977 and June 1978, 39 of the Iscor mainline locomotives were transferred to the SAR. They were initially designated "Class ex Iscor" and renumbered in the range from 34-501 to 34-539, but these units were also commonly referred to as Class from their SAR number range. This eventually became the accepted official classification. Five locomotives were retained by Iscor to work at the Sishen mine, numbers G01 to G04 and 40D. These are now Kumba Iron Ore’s units numbers 01 to 05, with no. 40D having become Kumba no. 05. The Douglas Colliery locomotives are now in Sheltam livery, initially as Sheltam numbers 5 and 6 and later renumbered to 2602 and 2603 respectively. South African Railways service While it is believed that they were for the most part renumbered from Iscor numbers to SAR numbers in sequence with their Iscor numbers, at least one locomotive has been observed as being out of sequence. No. 34-523 bore works plate no. 35265, identifying it as ex Iscor no. 5D. It can be presumed that no. 34-505 carried works plate GE 40402, which would make it ex Iscor no. 23D, but since the works plates have over time disappeared from most of these locomotives, this cannot be confirmed. Until 2012, when they began to be replaced by new GE Class type C30ACi locomotives, most of