South African Class 5E1, Series 1

Manufacturer

The first series of the 3 kV DC Class 5E1 electric locomotive was designed and built for the South African Railways (SAR) by Metropolitan-Vickers (Metrovick) at its Bowesfield Works. Metrovick was one of the companies owned by the Associated Electrical Industries (AEI) holding group who supplied the electrical equipment. In all, 135 locomotives were delivered between 1959 and 1961, numbered in the range from E364 to E498.

The Class 5E1 was virtually identical in outward appearance to the forerunner Class 5E, but with more powerful traction motors and with a new Commonwealth bogie design which gave a smoother ride. Apart from the bogies, an externally visible difference from the Class 5E is the size and location of the small panels on the lower body sides.

Class 5E1 series

The Class 5E1 was produced in five series, the Metrovick-built Series 1 and the Union Carriage & Wagon (UCW) built Series 2 to 5. Between 1959 and 1969 altogether 690 of them were built, 135 Series 1, 130 Series 2, 100 Series 3, 100 Series 4 and 225 Series 5.

With the exception of the Series 2 and 3, the series distinction between Class 5E1 locomotives was mainly based on the different model traction motors each was equipped with, MV 281 in Series 1, AEI 281 AZX in Series 2 and 3, AEI 281 AX in Series 4 and AEI 281 BX in Series 5. The distinction between the series 2 and 3 locomotives appears to have been based on the grounds of the design of their traction motor bearings.

Identifying features

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 number 2 end. A passage along the centre of the locomotive connects the cabs, which are identical except that Cab 2 is where the handbrake is located.

The locomotive has two cut-outs on the roofline on the roof access ladder side, but an unbroken roofline on the opposite side. Like the predecessor Class 5E, the Class 5E1, Series 1 had two rectangular panels on the lower sides above the battery box, but it also had an additional rectangular panel on the lower sides above the second axle from the left.

The Series 1 and 2 locomotives could be distinguished from each other by the builder's plates on their end doors, a rectangular Metropolitan-Vickers plate on Series 1 locomotives and an oval Union Carriage and Wagon plate on Series 2. The Series 3, 4 and 5 locomotives can be visually distinguished from earlier models by their three small square panels on the lower sides above the battery box, compared to the two larger rectangular panels on the Series 1 and 2 locomotives. Series 4 and 5 locomotives can be distinguished from all earlier models by their one small square and one larger rectangular panels on the lower sides above the second axle from the left, compared to the single rectangular panel on all earlier models.

Brakes

The locomotive itself used air brakes, but it was only equipped to operate trains with vacuum brakes. While hauling a train, the locomotive's air brake system would be made subordinate to the train's brake system and would come into operation as the train brakes were being applied, gradually building up to its maximum of 350 kilopascals (51 pounds per square inch). While working a train downgrade, the locomotive's regenerative braking system would also work in conjunction with the train brakes.

The locomotive's air brakes would usually only be used along with the train brakes during emergencies. Under normal circumstances the train would be controlled using the train brakes alone to slow down and stop.

While the locomotive was stopped, the air brakes on each bogie could be applied independently. The handbrake or parking brake, located in Cab no. 2, only operated on the unit's last axle, or no. 7 and 8 wheels.

Traction motor bearings

The axle-hung traction motors of all earlier SAR electric locomotives, up to and including the Class 5E1, Series 1, were suspended on the axles by means of plain oil-lubricated bearings consisting of bronze shells with white metal linings. With the introduction of the more powerful Class 5E1, Series 1, considerable trouble was experienced due to flaking of the white metal linings as a result of the increased intensity of the pressure on these bearings. The use of roller bearings was investigated and one traction motor of a Class 1E locomotive was converted for trial purposes. Since satisfactory results were obtained, it was decided to equip the traction motors of the subsequent Union Carriage and Wagon-built Series 2 and later locomotives with roller-type suspension bearings.

The Blue Train

The locomotives were placed in service in a bottle green and yellow whiskers livery. Beginning in 1960, a Gulf Red and yellow lines livery gradually replaced the green and yellow.

In the SAR era some selected electric and diesel-electric locomotives were painted blue for use with the Blue Train, but without altering the layout of the various paint schemes. Blue Train locomotives were therefore blue with yellow whiskers in the SAR era. During the 1970s eight Class 5E1, Series 1 locomotives, numbers E441 to E448, were painted blue with yellow whiskers for use with the Blue Train between Cape Town and Beaufort West in the Cape Western region. By 1981 they were all back in pool service and were gradually repainted to Gulf Red and whiskers again as they were outshopped.

Service

The Class 5E1 served on all 3 kV DC electrified mainlines country-wide for almost forty years, but by the early 2000s the Series 1 locomotives were all retired. Apart from numbers E397 and E461, whose shells have been converted to a club room at Sentrarand Depot, none of the Metrovick-built Class 5E1s are known to have survived. While these two shells are now painted in the SAR Blue Train livery, neither locomotive wore the blue livery while still in service.

Works numbers

The Metrovick works numbers of the Class 5E1, Series 1 and their years of construction, where known, are shown in the table.

Illustration

The main picture shows no. E464 at the Salt River Depot, Cape Town, on 7 January 1966. The Series 1 locomotives served only in the SAR livery with whiskers, be it bottle green, Gulf Red or blue.