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South African Class 7E4
The Spoornet Class 7E4 of 2001 is a South African electric locomotive.
In 1983 and 1984, the South African Railways placed sixty Class 7E3, Series 1 electric locomotives with a Co-Co wheel arrangement in mainline service. These were followed by another twenty-five Class 7E3, Series 2 locomotives in 1984 and 1985. Beginning in 2000, Spoornet rebuilt seventeen of these dual-cab locomotives to single-cab locomotives and reclassified them to Class 7E4.
The 25 kV AC Class 7E3 electric locomotives were designed for the South African Railways (SAR) by Hitachi and built in South Africa by Dorbyl, who also supplied the mechanical components.
Sixty Series 1 locomotives were delivered by Dorbyl in 1983 and 1984, numbered in the range from E7216 to E7275, and twenty-five Series 2 locomotives in 1984 and 1985, numbered in the range from E7276 to E7300. Like Union Carriage and Wagon, Dorbyl did not allocate builder's numbers to the locomotives it built for the SAR, but used the SAR unit numbers for their record keeping.
In the period from the early 1990s until about 2007, various modifications to improve downhill braking capacity were done to the Coalink line's Hitachi-designed locomotives. The first set of upgrades was done on the fifty Class 7E1 locomotives.
Beginning in 2000, seventeen Class 7E3 locomotives, sixteen Series 1, numbered in the range from E7260 to E7275, and one Series 2, no. E7276, underwent significant modifications. This included the installation of Hitachi micro-processor controls with improved rheostatic brakes, auxiliary inverters designed and built by Fuji Electric, Thelma and Cutler-Hammer rheostat grids, fans by Donkin Fans in Port Elizabeth, and conversion from double-cab to single-cab since the no. 2 end cab space was required for some of the new equipment which was installed. These single-cab locomotives were reclassified to Class 7E4 and the first of them entered service early in 2001.
The two sides of the locomotive are sufficiently different in appearance that a pair of them, coupled end to end, appears at first glance to be two different locomotive types. The left side is smooth while the right side has several large grilles.
The locomotive's pantograph placement is unusual in not being equidistant from the locomotive ends. The contact shoe centre of the front pantograph is 6,155 millimetres (20 feet 2.32 inches) from the longitudinal centre of the locomotive, while that of the rear pantograph is 5,920 millimetres (19 feet 5.07 inches) from the longitudinal centre.
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South African Class 7E4 AI simulator
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South African Class 7E4
The Spoornet Class 7E4 of 2001 is a South African electric locomotive.
In 1983 and 1984, the South African Railways placed sixty Class 7E3, Series 1 electric locomotives with a Co-Co wheel arrangement in mainline service. These were followed by another twenty-five Class 7E3, Series 2 locomotives in 1984 and 1985. Beginning in 2000, Spoornet rebuilt seventeen of these dual-cab locomotives to single-cab locomotives and reclassified them to Class 7E4.
The 25 kV AC Class 7E3 electric locomotives were designed for the South African Railways (SAR) by Hitachi and built in South Africa by Dorbyl, who also supplied the mechanical components.
Sixty Series 1 locomotives were delivered by Dorbyl in 1983 and 1984, numbered in the range from E7216 to E7275, and twenty-five Series 2 locomotives in 1984 and 1985, numbered in the range from E7276 to E7300. Like Union Carriage and Wagon, Dorbyl did not allocate builder's numbers to the locomotives it built for the SAR, but used the SAR unit numbers for their record keeping.
In the period from the early 1990s until about 2007, various modifications to improve downhill braking capacity were done to the Coalink line's Hitachi-designed locomotives. The first set of upgrades was done on the fifty Class 7E1 locomotives.
Beginning in 2000, seventeen Class 7E3 locomotives, sixteen Series 1, numbered in the range from E7260 to E7275, and one Series 2, no. E7276, underwent significant modifications. This included the installation of Hitachi micro-processor controls with improved rheostatic brakes, auxiliary inverters designed and built by Fuji Electric, Thelma and Cutler-Hammer rheostat grids, fans by Donkin Fans in Port Elizabeth, and conversion from double-cab to single-cab since the no. 2 end cab space was required for some of the new equipment which was installed. These single-cab locomotives were reclassified to Class 7E4 and the first of them entered service early in 2001.
The two sides of the locomotive are sufficiently different in appearance that a pair of them, coupled end to end, appears at first glance to be two different locomotive types. The left side is smooth while the right side has several large grilles.
The locomotive's pantograph placement is unusual in not being equidistant from the locomotive ends. The contact shoe centre of the front pantograph is 6,155 millimetres (20 feet 2.32 inches) from the longitudinal centre of the locomotive, while that of the rear pantograph is 5,920 millimetres (19 feet 5.07 inches) from the longitudinal centre.