{{Short description|Class of 1 South African 0-6-0de locomotive}} {{Use dmy dates|date=June 2024}} {{Use South African English|date=August 2013}} {{Infobox locomotive | name = South African Class DS1 | image = SAR Class DS1 D138 (D514).jpg | alt = | caption = No. D138, c. 1940 | hatnote = | powertype = Diesel-electric | designer = [[AEG (German company)|Allgemeine Elektricitäts-Gesellschaft]] | builder = {{nowrap|Allgemeine Elektricitäts-Gesellschaft}} | ordernumber = | serialnumber = AEG 5062/1939 (ESKOM locomotive) | buildmodel = SAR DS1 | builddate = 1939 | totalproduction = 2 | rebuilder = | rebuilddate = | numberrebuilt = | whytetype = {{Whyte|6w|DE}} | aarwheels = [[AAR wheel arrangement#C|C]] | uicclass = Co | Britishclass = Co | gauge = {{Track gauge|Cape|allk=on}} | bogies = | leadingdiameter = | wheeldiameter = {{convert|42|in|mm|0|abbr=on}} | trailingdiameter = | minimumcurve = | wheelbase = {{convert|11|ft|4|in|mm|0|abbr=on}} | bogie = | pivotcentres = | wheelspacing = | length = | over couplers = {{convert|30|ft|8+1/2|in|mm|0|abbr=on}} | over bufferbeams= {{convert|27|ft|10+1/2|in|mm|0|abbr=on}} | body = | width = | height = {{convert|12|ft|6+3/4|in|mm|0|abbr=on}} | axleload = {{convert|14|lt|7|lcwt|kg|sigfig=4|abbr=on}} | leadingbogie/pony= | weightondrivers = | trail bogie/pony = | locoweight = {{convert|40|lt|13|lcwt|abbr=on}} | fueltype = [[Diesel fuel|Diesel]] | fuelcap = {{convert|289|impgal|L|sigfig=3|abbr=on}} | lubecap = | coolantcap = | watercap = | sandcap = | powersupply = | consumption = | watercons = | primemover = MAN {{convert|265|hp|abbr=on}} | rpmrange = | rpmrange low = | rpmrange idle = | rpmrange max = | enginetype = | aspiration = | displacement = | alternator = | generator = AEG {{convert|110|kW|abbr=on}} main<br>AEG {{convert|12|kW|abbr=on}} auxiliary | tractionmotors = Three AEG | t/m amps 1 hr = | t/m amps cont = | headendpower = | cylindercount = Eight | cylindersize = | transmission = | gear ratio = 5.67:1 | multipleworking = | trainheating = | locobrakes = | dynamicpeakeffort= | trainbrakes = | reservoircap = | compressorcap = | exhaustercap = | safety = | coupling = [[Janney coupler|AAR knuckle]]<br>[[Railway coupling#Johnston coupler|Johnston link-and-pin]] (1956) | maxspeed = | poweroutput = {{convert|265|hp|kW|abbr=on}} | poweroutput start= | poweroutput 1 hr= | poweroutput cont= | tractiveeffort = | t/e starting = {{convert|17600|lbf|kN|abbr=on}} | t/e 1 hr = | t/e continuous = | factorofadhesion = 5•15 | f/adh starting = | f/adh 1 hr = | f/adh continuous= | locobrakeforce = | operator = South African Railways<br>ESKOM | operatorclass = Class DS1 | powerclass = | numinclass = 1 SAR, 1 ESKOM | fleetnumbers = D138, renumbered D514 | officialname = ''Citelec'' (ESKOM) | nicknames = | axleloadclass = | locale = | deliverydate = 1939 | firstrundate = 1939 | lastrundate = | withdrawndate = | preservedunits = | restoredate = | scrapdate = | currentowner = | disposition = | notes = }}
The '''South African Railways Class DS1''' of 1939 was a diesel-electric locomotive.
The second diesel-electric locomotive on the South African Railways was a single Class DS1 [[AEG (German company)|AEG]] diesel-electric [[shunting locomotive]] which was placed in service in 1939. Two of these locomotives were delivered to South Africa, one for the Railways and another for the Electricity Supply Commission.<ref name="Paxton-Bourne">{{Paxton-Bourne|pages=136–137}}</ref><ref name="SAR&H Mar 1947">Espitalier, T.J.; Day, W.A.J. (1947). ''The Locomotive in South Africa – A Brief History of Railway Development. Chapter VII – South African Railways (Continued).'' South African Railways and Harbours Magazine, March 1947. pp. 230–232.</ref>
==Manufacturer== As a result of the problems experienced in obtaining adequate water supplies in the arid regions of South Africa and [[South West Africa]], particularly on the section between [[De Aar]] in the [[Karoo]] via [[Upington]] to [[Keetmanshoop]], the South African Railways (SAR) decided to experiment with diesel-powered traction and introduced its first two diesel-electric shunting locomotives in 1939.<ref name="Paxton-Bourne"/><ref name="SAR&H Mar 1947"/>
The second of these was a single six-wheeled locomotive of which two units were ordered from ''[[AEG (German company)|Allgemeine Elektricitäts-Gesellschaft]]'' (AEG) in Berlin at the same time as the single [[South African Class DS|Class DS]] locomotive.<ref name="Paxton-Bourne"/><ref name="SAR&H Mar 1947"/>
Only one of them entered service on the SAR and was designated Class DS1. It was initially numbered D138, but it was soon renumbered to D514. Both numbers were actually in the electric locomotive number range.<ref name="Paxton-Bourne"/><ref name="SAR&H Mar 1947"/>
The second locomotive was delivered to the Electricity Supply Commission (ESCOM), the state-owned South African national power corporation, who placed it in service in Cape Town.<ref name="Paxton-Bourne"/><ref name="SAR&H Mar 1947"/>
==Characteristics== The locomotive was powered by a ''[[MAN SE|Maschinenfabrik Augsburg-Nürnberg]]'' (MAN) {{convert|265|hp|abbr=off}} eight-cylinder diesel engine prime mover. An AEG {{convert|110|kW|abbr=off}} main generator and an AEG {{convert|12|kW|abbr=off}} auxiliary generator were mounted directly in line between the engine and the cab. The engine was water-cooled with a fan that was belt-driven by the engine and that drew air through a conventional radiator.<ref name="Paxton-Bourne"/><ref name="diagram-book">South African Railways and Harbours Locomotive Diagram Book, 2'0" & 3'6" Gauge Steam Locomotives, 15 August 1941, as amended</ref>
This three-axle locomotive was essentially half a Class DS locomotive. Each axle was driven by a force-ventitated axle-suspended DC traction motor and sanding was arranged at the back and front of all wheels. Its single engine compartment was identical to either one of the two engine compartments of the Class DS. The cab was also identical to that of the Class DS, equipped with mechanically interlocked dual controls to enable operation in either direction.<ref name="Paxton-Bourne"/><ref name="SAR&H Mar 1947"/><ref name="diagram-book"/>
==Service==
===South African Railways=== The SAR Class DS1 was withdrawn from yard service in July 1956 and transferred to the SAR's Civil Engineering department, who continued to use it for shunting at the [[Braamfontein]] Electric Running Shed (ERS) in [[Johannesburg]] into the early 1960s.<ref name="Paxton-Bourne"/> Since it was used to move trolleys with heavy traction motors around the workshop, the original [[Janney coupler|AAR knuckle]] coupler was replaced by a low-mounted [[Railway coupling#Johnston coupler|Johnston link-and-pin]] coupler and the original coupler pockets were blanked off.
[[File:SAR Class DS1 D514.jpg|thumb|300px|No. D514 at Braamfontein Electric Running Shed]] When it was finally retired from service and replaced by a [[South African Class S2 0-8-0|Class S2]] shunting steam locomotive, it was plinthed on a short piece of track on the western side of the Braamfontein ERS. The picture alongside shows the locomotive at Braamfontein, with the bell coupler mounted barely above track level and with the original coupler pocket blanked off.<ref>[http://finance.groups.yahoo.com/group/sar-L/message/44237 SAR-L Group: Message #44237 by Les Smith on 29 November 2012]{{dead link|date=December 2023|bot=medic}}{{cbignore|bot=medic}}</ref>
===ESKOM=== The ESKOM locomotive was initially employed by the City of Cape Town at the [[Table Bay]] Power Station. It was painted in a maroon livery and was named ''Citelek''. It was later transferred to the [[Athlone, Cape Town|Athlone]] Power Station in Cape Town, where it was scrapped in about 1966.<ref name="Paxton-Bourne"/>
==References== {{Commons category|South African Class DS1|position=left}} {{Reflist}} {{Locomotives of South Africa}}
[[Category:Diesel–electric locomotives of South Africa|3280]] [[Category:C locomotives]] [[Category:Co locomotives]] [[Category:AEG locomotives]] [[Category:Cape gauge railway locomotives]] [[Category:Railway locomotives introduced in 1939]] [[Category:1939 in South Africa]] [[Category:Shunting locomotives]]