E2181 Johannesburg-Durban special,

Beginning in 2000 Spoornet embarked on a program to rebuild dual cab Class 6E1, Series 2 to Series 11 locomotives to single cab Class 18E, Series 1 locomotives that were renumbered in the ranges 18-001 to 18-434 and 18-500 to 18-525. The rebuilding included the installation of Alsthom micro-processor control technology and was done by Transwerk (later Transnet Rail Engineering and then Transnet Engineering) at its Koedoespoort shops in Pretoria, Gauteng. In the process their number 1 end cabs were stripped of all controls in order to have a toilet installed.
18-201 was rebuilt from Class 6E1, Series 8 E1969 and commissioned in 2005.
See also the Wikipedia article on the South African Class 18E, Series 1.

Beginning in 2000 Spoornet embarked on a program to rebuild dual cab Class 6E1, Series 2 to Series 11 locomotives to single cab Class 18E, Series 1 locomotives that were renumbered in the ranges 18-001 to 18-434 and 18-500 to 18-525. The rebuilding included the installation of Alsthom micro-processor control technology and was done by Transwerk (later Transnet Rail Engineering and then Transnet Engineering) at its Koedoespoort shops in Pretoria, Gauteng. In the process their number 1 end cabs were stripped of all controls in order to have a toilet installed.
18-298 was rebuilt from Class 6E1, Series 8 E1901 and commissioned in 2006.
See also the Wikipedia article on the South African Class 18E, Series 1.

The rebuilding of dual cab Class 6E1, Series 2 to Series 8 locomotives to single cab Class 18E, Series 2 locomotives commenced in 2009, with their runnind numbers beginning at 18-600. The rebtilding included the installation of Alsthom micro-processor control technology and was done by Transnet Rail Engineering (previously Transwerk and lates Transnet Engineering) at its Koedlespoort shops in Pretoria, Gauteng. In the process their number 1 end cabs were stripped of all controls in order to have a toilet installed.
18-663 waq rebuilt from Class 6E1, Series 5 E1609 and commissioned in 2011.
See also the Wikipedia article on the South African Class 18E, Series 2.