South African Class 61-000

South African Classes 1-DH & 61-000
Rhodesia Railways Class DH1

No. D750, later no. 61-006, Kassel, Germany, c. 1958

Type and origin
Power type	Diesel-hydraulic
Designer	Henschel & Son
Builder	Henschel & Son
Serial number	29745-29751
Model	DH-1420
Build date	1958
Total produced	7

Specifications
AAR wheel arr.	B-B
UIC class	B'B'
Gauge	3 ft 6 in (1,067 mm) Cape gauge
Wheel diameter	1,054 mm (41.5 in)
Wheelbase	11,608 mm (38 ft 1.0 in)
• Bogie	2,184 mm (7 ft 2.0 in)
Pivot centres	9,423 mm (30 ft 11.0 in)
Length:
• Over couplers	16,551 mm (54 ft 3.6 in)
• Over beams	15,507 mm (50 ft 10.5 in)
Width	3,004 mm (9 ft 10.3 in)
Height	3,948 mm (12 ft 11.4 in)
Axle load	18,900 kg (41,700 lb)
Adhesive weight	75,600 kg (166,700 lb)
Loco weight	75,600 kg (166,700 lb)
Fuel type	Diesel
Fuel capacity	2,730 litres (600 imp gal)
Lubricant cap	546 litres (120 imp gal)
Sandbox cap	Eight 0.13 m³ (4.6 cu ft) boxes
Electric system(s)	Type 4 WHHP 315 batteries * 64 V, 32 Cells, 280 amp/hr * 2 Delco & Bendix starters
Prime mover	GM-EMD type 6/567C
RPM range	835 maximum
Engine type	2-stroke diesel
Generator	10 kW (13 hp) 80 V 800 to 2,400 rpm (Auxiliary)
Cylinders	2 x V6
Cylinder size	215.9 mm (8.5 in) bore 254 mm (10.0 in) stroke
Transmission	Voith Type L306r, 3 torque converters, using Cardan shafts
MU working	3 maximum
Loco brake	Westinghouse
Train brakes	Air & vacuum
Couplers	AAR knuckle

Performance figures
Maximum speed	88.5 km/h (55.0 mph)
Power output	2 x 491 kW (658 hp)
Tractive effort:
• Starting	197.2 kN (44,300 lbf) @ 9.6 km/h (6.0 mph)
• 1 hour	148 kN (33,000 lbf) @ 16 km/h (9.9 mph)
• Continuous	99.1 kN (22,300 lbf) @ 24 km/h (15 mph)
Loco brakeforce	77% @ 393 kPa (57.0 psi)

Career
Operators	South African Railways Rhodesia Railways National Railways of Zimbabwe Zimbabwe Iron and Steel Company
Class	SAR Class 1-DH, Class 61-000 RR & NRZ Class DH1
Number in class	7
Numbers	SAR 61-001 to 61-007 (ex D745 to D751) RR & NRZ 3101-3106
Delivered	1959
First run	1959
Withdrawn	1971
Disposition	6 sold to RR

The South African Railways Class 61-000 of 1959 was a diesel-hydraulic locomotive.

Between May and July 1959, the South African Railways placed seven Class 1-DH Henschel type DH-1420 diesel-hydraulic locomotives in service, to also gain experience with other forms of diesel motive power than diesel-electric. The locomotives were later reclassified to Class 61-000. In 1971, six of them were sold to Rhodesia Railways.^[1]

Manufacturer

The Class 61-000 type DH-1420 diesel-hydraulic locomotive was designed and built for the South African Railways (SAR) by Henschel and Son in Kassel, Germany. Upon delivery, the locomotives were classified as Class 1-DH and numbered in the range from D745 to D751. When the SAR adopted a new classification and numbering system for electric- and diesel-powered locomotives c. 1960, they were reclassified as Class 61-000 and renumbered in the range from 61-001 to 61-007.^[1]^[2]

The Class 1-DH was acquired a year after the SAR had acquired its first diesel-electric locomotives to be built in quantity, the Class 1-DE, which had entered service in 1958 and which was later reclassified to Class 31-000. At the time, the SAR was still making extensive use of steam traction and limited use of electric traction. Its first diesel traction acquisitions were therefore the diesel-electric Class 1-DE and diesel-hydraulic Class 1-DH, to gain experience with both forms of diesel motive power.^[1]

Diesel-hydraulic transmission

The more commonly used diesel-electric locomotive makes use of a diesel engine prime mover to propel either a generator (DC) or an alternator (AC) to generate electric power, which is then used to propel axle-hung electric traction motors, one per powered axle, to drive the locomotive wheels. It therefore works on the same principle as a regular electric locomotive, the only difference being that it generates its own electric power instead of collecting it from an external supply such as overhead catenary or a third rail.^[1]^[3]

Diesel-hydraulic locomotives, on the other hand, use hydrokinetic transmission, also known as hydrodynamic transmission, in the form of torque converters to transmit power from prime mover to wheels.^[4]

Characteristics

The Class 61-000 was a centre-cab locomotive which was powered by two General Motors Electro-Motive Division (GM-EMD) type 6/567C V6 prime movers, each with a Voith type L306r triple-converter torque converter and each driving the wheels of one bogie. Power was transferred to the axles through drive shafts. Unlike diesel-electric locomotives, where each axle is driven by its own traction motor, individual wheel-slip was not possible on the Class 61-000, since each bogie's two axles were interconnected through the drive shafts.^[2]

The cab had two control stands and, since it was possible to start the six prime movers in three consisted locomotives from one engine cab, each control stand had six engine start buttons and six engine stop buttons. The electrical system was very complicated and unreliable, which eventually led to the locomotives being completely rewired in 1963.^[1]

Service

South African Railways

The Class 61-000s spent their entire SAR working lives stationed at the Germiston diesel depot. One of them, no. 61-006, was involved in a head-on collision at Kaserne on 8 October 1966, and was eventually scrapped at the Koedoespoort workshops in Pretoria in September 1968. Problems with cracked axles resulted in the rest of the fleet being staged for repairs in 1967.^[1]^[5]

Rhodesia Railways

In 1971, the remaining six locomotives were sold to Rhodesia Railways (RR), later renamed the National Railways of Zimbabwe (NRZ), where they became the RR Class DH1 and were renumbered in the range from 3101 to 3106.^[1]^[2]

ZISCO

They were eventually resold to the Zimbabwe Iron and Steel Company (ZISCO) steel works at KweKwe in Zimbabwe. Most, if not all, were scrapped by 2001.^[5]

Works numbers

The Class 61-000 builder's works numbers and renumbering upon reclassification and sale, are listed in the table.^[6]^[5]

**Class 61-000 works numbers and renumbering**
SAR 1-DH no.	SAR 61-000 no.	Henschel works no.	RR & NRZ no.
D745	61-001	29745	3101
D746	61-002	29746	3102
D747	61-003	29747	3103
D748	61-004	29748	3104
D749	61-005	29749	3105
D750	61-006	29750
D751	61-007	29751	3106

Illustration

No. D750, later no. 61-006, under construction at Henschel's plant at Kassel, Germany, c. 1958

References

1 2 3 4 5 6 7 Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 143–144. ISBN 0869772112.
1 2 3 RR Class DH1 dimensional drawing
↑ 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
↑ Diesel-hydraulic locomotive
1 2 3 Middleton, John N. (2002). Railways of Southern Africa Locomotive Guide - 2002 (as amended by Combined Amendment List 4, January 2009) (2nd, Dec 2002 ed.). Herts, England: Beyer-Garratt Publications. p. 78.
↑ Henschel-Lieferliste (Henschel & Son works list), compiled by Dietmar Stresow

Wikimedia Commons has media related to South African Class 61-000.

Locomotives of South Africa

Steam

7' ¼" gauge	East London 0-4-0VB Table Bay 0-4-0ST Table Bay 0-4-0T Table Bay 0-4-0WT

4' 8½" gauge	Cape 0-4-0T Blackie Cape 0-4-2 Cape 2-4-0T CGR 0-4-0ST Aid Natal 0-4-0ST Durban Natal 0-4-0WT Natal Natal 4-4-0T Perseverance

3' 6" gauge Tank engines	CGR 0-4-0ST 1873 CGR 0-4-0ST 1874 CGR 0-4-0ST 1881 CGR 0-4-0ST 1881 Coffee Pot CGR 0-6-0ST CGR 0-6-0T CGR 2-6-0ST 1900 CGR 2-6-0ST 1902 CGR 1st Class 0-4-0ST 1875 CGR 1st Class 0-4-0ST 1876 CGR 1st Class 2-6-0ST CGR 1st Class 4-4-0T CGR 2nd Class 4-4-0T CGR 3rd Class 2-6-0T CGR Railmotor CSAR Class C CSAR Class E CSAR Rack 4-6-4RT CSAR Railmotor Durban's Congella Durban's Edward Innes Durban's John Milne Durban's Sir Albert Port Elizabeth 0-4-0ST Kowie Railway 0-6-0T Kowie Railway 4-4-0T Metropolitan & Suburban 4-6-2T NGR 2-6-0T Durban & Pietermaritzburg NGR Class I 2-6-2T NGR Class K 0-4-0ST NGR Class K 0-6-0ST NGR Class K 2-6-0T NZASM 10 Tonner NZASM 13 Tonner NZASM 14 Tonner NZASM 18 Tonner NZASM 19 Tonner NZASM 32 Tonner NZASM 40 Tonner PPR 26 Tonner PPR 35 Tonner Portuguese SAR Class A SAR Class B SAR Class C SAR Class C1 SAR Class C2 SAR Class D SAR Class E SAR Class F SAR Class G SAR Class H SAR Class H1 SAR Class H2 SAR Class J SAR Class K SAR Railmotor SAR Dock 0-4-0ST SAR Dock 0-4-0T SWA 2-8-0T

3' 6" gauge Tender engines	CGR 1st Class 2-6-0 1876 BP CGR 1st Class 2-6-0 1876 Kitson CGR 1st Class 2-6-0 1879 CGR 1st Class 2-6-0 1891 CGR 1st Class 4-4-0 CGR 1st Class 4-4-0TT CGR 2nd Class 2-6-2TT CGR 3rd Class 4-4-0 1883 CGR 3rd Class 4-4-0 1884 CGR 3rd Class 4-4-0 1889 CGR 3rd Class 4-4-0 1898 CGR 3rd Class 4-4-0 1901 CGR 3rd Class 4-4-0 1903 CGR 4th Class 4-4-2 CGR 4th Class 4-6-0TT 1880 CGR 4th Class 4-6-0TT 1882 CGR 4th Class 4-6-0TT 1882 Joy CGR 4th Class 4-6-0TT 1884 CGR 5th Class 4-6-0 1890 CGR 5th Class 4-6-0 1891 NGR Havelock NGR Class I SAR Class Exp 1 SAR Class Exp 2 SAR Class Exp 3 SAR Class Exp 4 SAR Class Exp 5 SAR Class Exp 6 SAR Class S SAR Class S1 SAR Class S2 SAR Class 1 SAR Class 1A SAR Class 1B SAR Class 2 SAR Class 2C SAR Class 3 SAR Class 3A SAR Class 3B SAR Class 4 SAR Class 4A SAR Class 5 SAR Class 5A SAR Class 5B SAR Class 6 SAR Class 6A SAR Class 6B SAR Class 6C SAR Class 6D SAR Class 6E SAR Class 6F SAR Class 6G SAR Class 6H SAR Class 6J SAR Class 6K SAR Class 6L SAR Class 6Y SAR Class 6Z SAR Class 7 SAR Class 7A SAR Class 7B SAR Class 7C SAR Class 7D SAR Class 7E SAR Class 7F SAR Class 8 SAR Class 8A SAR Class 8B SAR Class 8C SAR Class 8D SAR Class 8E SAR Class 8F SAR Class 8R SAR Class 8X SAR Class 8Y SAR Class 8Z SAR Class 9 SAR Class 10 SAR Class 10A SAR Class 10B SAR Class 10C SAR Class 10D SAR Class 11 SAR Class 12 SAR Class 12A SAR Class 12B SAR Class 13 SAR Class 14 SAR Class 14A SAR Class 14B SAR Class 14C 1st SAR Class 14C 2nd SAR Class 14C 3rd SAR Class 14C 4th SAR Class 15 SAR Class 15A SAR Class 15B SAR Class 15C SAR Class 15CA SAR Class 15E SAR Class 15F SAR Class 16 SAR Class 16A SAR Class 16B SAR Class 16C SAR Class 16D SAR Class 16DA 1928 SAR Class 16DA 1930 SAR Class 16E SAR Class 17 SAR Class 18 SAR Class 19 SAR Class 19A SAR Class 19B SAR Class 19C SAR Class 19D SAR Class 20 SAR Class 21 SAR Class 23 SAR Class 24 SAR Class 25 SAR Class 25NC SAR Class 26 SAR Katanga SWA 2-8-0

3' 6" gauge Articulated engines	CGR Fairlie CGR Kitson-Meyer SAR Class FC SAR Class FD SAR Class GA SAR Class GB SAR Class GC SAR Class GCA SAR Class GD SAR Class GDA SAR Class GE SAR Class GEA SAR Class GF SAR Class GG SAR Class GH SAR Class GK SAR Class GL SAR Class GM SAR Class GMA SAR Class GO SAR Class HF SAR Class KM SAR Class MA SAR Class MB SAR Class MC SAR Class MC1 SAR Class MD SAR Class ME SAR Class MF SAR Class MG SAR Class MH SAR Class MJ SAR Class MJ1 SAR Class U

2' 6" gauge	Cape Copper John King & Miner Cape Copper Britannia Cape Copper Caledonia Cape Copper Clara Cape Copper Condenser Cape Copper Scotia Namaqua Copper Pioneer Walvis Bay 2-4-2T Hope

2' & 600mm gauges	ACR Class NG-G16A CGR NG 0-4-0T CGR NG 0-6-0T CGR NG 4-6-2T CGR Type A 2-6-4T CGR Type C 0-4-0T NGR Class N 4-6-2T SAR Dutton SAR NG 0-4-0T SAR Class NG1 SAR Class NG2 SAR Class NG3 SAR Class NG4 SAR Class NG5 SAR Class NG6 SAR Class NG7 SAR Class NG8 SAR Class NG9 SAR Class NG10 SAR Class NG-G11 SAR Class NG-G12 SAR Class NG-G13 SAR Class NG-G14 SAR Class NG15 SAR Class NG-G16 SWA Class Ha SWA Class Hb SWA Class Hc SWA Class Hd SWA Jung SWA Zwillinge

Electric

Amcoal Class E38

Gas-electric

SAR Gas-electric

Diesel

3' 6" gauge Diesel-electric	PRASA Class Afro 4000 SAR Class DS SAR Class DS1 SAR Class 31-000 SAR Class 32-000 SAR Class 32-200 SAR Class 33-000 SAR Class 33-200 SAR Class 33-400 SAR Class 34-000 SAR Class 34-200 SAR Class 34-400 SAR Class 34-500 SAR Class 34-600 SAR Class 34-800 SAR Class 34-900 SAR Class 35-000 SAR Class 35-200 SAR Class 35-400 SAR Class 35-600 TFR Class 35-800 SAR Class 36-000 SAR Class 36-200 SAR Class 37-000 Spoornet Class 39-000 TFR Class 39-200 TFR Class 43-000 TFR Class 44-000

2' gauge Diesel-electric	SAR Class 91-000

3' 6" gauge Diesel-hydraulic	SAR Class 61-000

3' 6" gauge Electro-diesel	Spoornet Class 38-000

Locomotives of Rhodesia and Zimbabwe

Steam	6th 6A 7th 8th 9th 9A 9B 10th 11th 11A 12th 12A 13th 14th 14A 15th 15A 16th 16A 17th 18th 19th 20th 20A

Diesel	DE1 DE2 DE3 DE4 DE5 DE6 DE7 DE8 DE8A DE8B DE9 DE9A DH1 DE10 DE10A DE10B

Electric	EL1

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