South African Class 6E1, Series 6

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South African Class 6E1, Series 6
SAR Class 6E1 Series 6 E1708.JPG
No. E1708 at Kaalfontein, Gauteng, 8 October 2009
Type and origin
Power type Electric
Designer Union Carriage and Wagon
Builder Union Carriage and Wagon
Model UCW 6E1
Build date 1976-1977
Total produced 100
Rebuilder Transnet Rail Engineering
Rebuild date 2003-2014
Number rebuilt 90 to Class 18E, Series 1 & 2
Specifications
AAR wheel arr. B-B
UIC class Bo'Bo'
Gauge 3 ft 6 in (1,067 mm) Cape gauge
Wheel diameter 1,220 mm (48.0 in)
Wheelbase 11,279 mm (37 ft 0.1 in)
 • Bogie 3,430 mm (11 ft 3.0 in)
Pivot centres 7,849 mm (25 ft 9.0 in)
Panto shoes 6,972 mm (22 ft 10.5 in)
Length:
 • Over couplers 15,494 mm (50 ft 10.0 in)
 • Body 14,631 mm (48 ft 0 in)
Width 2,896 mm (9 ft 6.0 in)
Height:
 • Pantograph 4,089 mm (13 ft 5.0 in)
 • Body height 3,937 mm (12 ft 11.0 in)
Axle load 22,226 kg (49,000 lb)
Adhesive weight 88,904 kg (196,000 lb)
Loco weight 88,904 kg (196,000 lb)
Power supply Catenary
Current collection Pantographs
Traction motors Four AEI-283AY
 • Rating 1 hour 623 kW (835 hp)
 • Continuous 563 kW (755 hp)
Gear ratio 18:67
Loco brake Air & Regenerative
Train brakes Air & Vacuum
Couplers AAR knuckle
Performance figures
Maximum speed 113 km/h (70 mph)
Power output:
 • 1 hour 2,492 kW (3,342 hp)
 • Continuous 2,252 kW (3,020 hp)
Tractive effort:
 • Starting 311 kN (70,000 lbf)
 • 1 hour 221 kN (50,000 lbf)
 • Continuous 193 kN (43,000 lbf) @ 40 km/h (25 mph)
Career
Operators South African Railways
Spoornet
Transnet Freight Rail
PRASA
Class Class 6E1
Power class 3 kV DC
Number in class 100
Numbers E1646-E1745
Delivered 1976-1977
First run 1976

The South African Railways Class 6E1, Series 6 of 1976 is an electric locomotive.

In 1976 and 1977, the South African Railways placed one hundred Class 6E1, Series 6 electric locomotives with a Bo-Bo wheel arrangement in mainline service.[1]

Manufacturer[edit]

The 3 kV DC Class 6E1, Series 6 electric locomotive was designed and built for the South African Railways (SAR) by Union Carriage and Wagon (UCW) in Nigel, Transvaal. The electrical equipment was supplied by the General Electric Company (GEC).[2]

One hundred locomotives were delivered in 1976 and 1977, numbered in the range from E1646 to E1745. UCW did not allocate builder’s numbers to the locomotives it built for the SAR and used the SAR unit numbers for their record keeping.[1]

Characteristics[edit]

Bogies[edit]

Series 2 to 11 bogies
Bogie frame and wheels

The Class 6E1 was built with sophisticated traction linkages on their bogies. Together with the locomotive's electronic wheel-slip detection system, these traction struts, mounted between the linkages on the bogies and the locomotive body and colloquially referred to as grasshopper legs, ensure the maximum transfer of power to the rails without causing wheel-slip, by reducing the adhesion of the leading bogie and increasing that of the trailing bogie by as much as 15% upon starting off. This feature is controlled by electronic wheel-slip detection devices and an electric weight transfer relay, which reduce the anchor current to the leading bogie by as much as 50A in notches 2 to 16.[3]

Brakes[edit]

The locomotive itself used air brakes, but it was equipped to operate trains with air or vacuum brakes. While hauling a vacuum braked train, the locomotive's air brake system would be disabled and the train would be controlled by using the train brakes alone to slow down and stop. While hauling an air braked train, on the other hand, the locomotive brakes would engage along with the train brakes. While working either type of train downgrade, the locomotive's regenerative braking system would also work in conjunction with the train brakes.[4]

When the locomotive was stopped, the air brakes on both bogies were applied together. The handbrake or parking brake, located in Cab no. 2, only operated on the unit's last axle, or no. 7 and 8 wheels.[4]

Orientation[edit]

These dual cab locomotives have a roof access ladder on one side only, just to the right of the cab access door. The roof access ladder end is marked as the no. 2 end. A corridor along the centre of the locomotive connects the cabs, which are identical apart from the fact that the handbrake is located in cab 2. A pantograph hook stick is stowed in a tube, mounted below the lower edge of the locomotive body on the roof access ladder side. The locomotive has three small panels along the lower half of the body on the roof access ladder side, and only one panel on the opposite side.[1]

Series identifying features[edit]

Grilles without beading on Series 5 no. E1631
Grilles with beading on Series 6 no. E1672

The Class 6E1 was produced in eleven series over a period of nearly sixteen years. While some Class 6E1 series are visually indistinguishable from their predecessors or successors, some externally visible changes did occur over the years. Series 1 locomotives had their sandboxes mounted on the bogies, while Series 2 to 11 had their sandboxes mounted along the bottom edge of the locomotive body, with the sandbox lids fitting into recesses in the body.[1]

The Series 6 and Series 7 locomotives are visually indistinguishable from each other, but can be distinguished from all the older series models by the rainwater beading which was added above the small grilles on the sides, just to the right of the side doors.[1][3]

Service[edit]

The Class 6E1 family saw service all over both of the 3 kV DC mainline and branchline networks, the smaller Cape Western network between Cape Town and Beaufort West and the larger network which covers portions of the Northern Cape, the Free State, Natal, Gauteng, North West Province and Mpumalanga.[5]

Reclassification and rebuilding[edit]

Reclassification to Class 16E[edit]

No. E1709 as Class 16E no. 16-422B, Germiston, 6 December 1991

During 1990 and 1991, Spoornet semi-permanently coupled several pairs of otherwise largely unmodified Class 6E1 locomotives, reclassified them to Class 16E and allocated a single locomotive number to each pair, with the individual locomotives in the pairs inscribed "A" or "B". The aim was to accomplish savings on cab maintenance by coupling the locomotives at their no. 1 ends, abandoning the no. 1 end cabs in terms of maintenance and using only the no. 2 end cabs. Most pairs were later either disbanded, with the locomotives reverting to Class 6E1 and regaining their original numbers, or getting rebuilt to Class 18E.[5]

Eleven known Series 6 locomotives were part of such Class 16E pairs.[5]

  • E1653 became 16-420A.
  • E1699 and E1700 became 16-425 A and B.
  • E1669 and E1709 became 16-422 A and B.
  • E1684 and E1701 became 16-427 A and B.
  • E1718 and E1720 became 16-428 A and B.
  • E1679 and E1714 became 16-429 A and B.

Rebuilding to Class 18E[edit]

Cab 1 of Class 18E no. 18-611, ex Class 6E1 no. E1677, Warrenton, Northern Cape, 21 May 2013

Beginning in 2000, Spoornet began a project to rebuild Series 2 to 11 Class 6E1 locomotives to Class 18E, Series 1 and Series 2 at the Transnet Rail Engineering (TRE) workshops at Koedoespoort. In the process the cab at the no. 1 end was stripped of all controls and the driver's front and side windows were blanked off to have a toilet installed, thereby forfeiting the locomotive's bi-directional ability.[5][6]

Since the driving cab's noise level had to be below 85 decibels, cab 2 was selected as the Class 18E driving cab, primarily based on its lower noise level compared to cab 1, which is closer and more exposed to the compressor's noise and vibration. Another factor was the closer proximity of cab 2 to the low voltage switch panel. The fact that the handbrake was located in cab 2, was not a deciding factor, but was considered an additional benefit.[6]

The known Class 6E1, Series 6 locomotives which were used in this project, were rebuilt to Class 18E, Series 1 as well as Series 2 locomotives. Their numbers and renumbering details are listed in the table.[6]

Illustration[edit]

All the Class 6E1, Series 6 locomotives were delivered in the SAR Gulf Red and yellow whiskers livery. The main picture shows no. E1708 in the Spoornet lined orange livery, passing through Kaalfontein on 8 October 2009. Illustrated below are some of the other liveries in which Series 6 locomotives served.

References[edit]

  1. ^ a b c d e South African Railways Index and Diagrams Electric and Diesel Locomotives, 610mm and 1065mm Gauges, Ref LXD 14/1/100/20, 28 January 1975, as amended
  2. ^ "UCW - Electric locomotives" (PDF). The UCW Partnership. Archived from the original (PDF) on 12 October 2007. Retrieved 30 September 2010. 
  3. ^ a b Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 128–129. ISBN 0869772112. 
  4. ^ a b Operation - South African Classes 6E, 6E1, 16E, 17E and 18E
  5. ^ a b c d Railways of Southern Africa Locomotive Guide, 2002 Edition, (Compiled by John N. Middleton), p57, as amended by Combined Amendment List 4, January 2009
  6. ^ a b c Information gathered from the rebuild files of individual locomotives at Transnet Rail Engineering’s Koedoespoort shops, or obtained from John Middleton as well as several Transnet employees

External video link[edit]

External video
E1653, E1265 and E1682 enter the Capital Park yard on their way to the loco depot, 1 October 2009 (46 seconds)