NZASM 18 Tonner 0-6-0ST

NZASM no. 13, Delagoa Bay Railway no. 57

Type and origin
Power type	Steam
Designer	Manning Wardle
Builder	Manning Wardle
Serial number	1177-1179, 1186-1188
Build date	1890
Total produced	6

Specifications
Configuration	0-6-0ST (Six-coupled)
Driver	2nd coupled axle
Gauge	3 ft 6 in (1,067 mm) Cape gauge
Coupled dia.	36 in (914 mm)
Wheelbase	10 ft 10 in (3,302 mm)
• Coupled	10 ft 10 in (3,302 mm)
Wheel spacing (Assymetrical)	1-2: 5 ft 3 in (1,600 mm) 2-3: 5 ft 7 in (1,702 mm)
Length:
• Over couplers	21 ft 10 in (6,655 mm)
Width	6 ft 8 in (2,032 mm)
Height	10 ft 4 ¹⁄₂ in (3,162 mm)
Frame type	Plate
Axle load	5 LT 18 cwt (5,995 kg)
• Coupled	5 LT 18 cwt (5,995 kg)
Loco weight	17 LT 14 cwt (17,980 kg)
Fuel type	Coal
Fuel capacity	15 long hundredweight (0.8 t)
Water cap	460 imp gal (2,090 l)
Firebox type	Round-top
• Firegrate area	6 sq ft (0.56 m²)
Boiler:
• Pitch	4 ft 9 ¹⁄₂ in (1,460 mm)
• Diameter	2 ft 9 in (838 mm) outside
• Tube plates	8 ft (2,438 mm)
• Small tubes	97: 1 ⁷⁄₈ in (48 mm)
Boiler pressure	140 psi (965 kPa)
Heating surface	424 sq ft (39.4 m²)
• Tubes	381 sq ft (35.4 m²)
• Firebox	43 sq ft (4.0 m²)
Cylinders	Two
Cylinder size	12 in (305 mm) bore 17 in (432 mm) stroke
Valve gear	Stephenson
Valve type	Slide
Couplers	Bell link-and-pin

Performance figures
Tractive effort	7,140 lbf (31.8 kN) @ 75%

Career
Operators	Delagoa Bay Railway NZASM Imperial Military Railways Central South African Railways
Class	NZASM 18 Tonner
Number in class	6
Numbers	Delagoa 53-58 NZASM 9-14 IMR 606-611
Official name	18 Tonner
Delivered	1890
First run	1890

The NZASM 18 Tonner 0-6-0ST of 1890 was a South African steam locomotive from the pre-Union era in Transvaal.

In 1890, the Nederlandsche-Zuid-Afrikaansche Spoorweg-Maatschappij of the Zuid-Afrikaansche Republiek (Transvaal Republic) placed six saddle-tank locomotives with a 0-6-0ST wheel arrangement in service on construction work. Since the railway classified its locomotives according to their weight, these engines were known as the 18 Tonners.^[1]^[2]

The Delagoa Bay line

In order to have an outlet to a harbour, a railway line from Delagoa Bay in Mozambique to Pretoria had been proposed to the Volksraad of the Zuid-Afrikaansche Republiek (ZAR) by President F.T. Burgers as far back as 1872. The Portuguese supported the idea, since it would open a trade route from Mozambique into the interior. In 1883, Major Joachim Machado was sent to the Transvaal to report on a proposed route through the Komati river and Crocodile river valleys towards the Highveld and Pretoria. The resulting agreement was for the Portuguese to construct the section from Delagoa Bay (now Maputo) to the border at Komatipoort, while the ZAR would be responsible for the continuation of the line to Pretoria.^[2]^[3]

The Nederlandsche-Zuid-Afrikaansche Spoorweg-Maatschappij (NZASM) was established on 21 June 1887 and proposed to construct two lines simultaneously. One was a 16 miles (26 kilometres) long railway line from Johannesburg to Boksburg, which became known as the Randtram line. The other was the first section of the Delagoa Bay line from the Mozambique border, via Nelspruit to Pretoria.^[1]^[2]^[3]

The Randtram line was officially opened on 17 March 1890. The Portuguese line from Delagoa Bay had already reached the border on 14 December 1887, but the first train from Delagoa Bay only entered Komatipoort on 1 July 1891, when the NZASM's contractors completed the bridge across the Komati river. The line from Komatipoort to Nelspruit was completed by 20 June 1892. Waterval Boven was reached on 20 June 1894 and Balmoral, near Witbank, on 20 October 1894, where connection was made with the line which had simultaneously been built eastwards from Pretoria.^[2]^[3]

Manufacturer

Six saddle-tank locomotives, built by Manning Wardle and Company, were placed in service by the NZASM in 1890 and were used mainly on construction work. Since the NZASM classified its locomotives according to their weight, they were known as 18 Tonners.^[1]

As was often the practice at the time, they were purchased from the manufacturer and imported by agents, acting on behalf of the end customer, the agent in the case of the 18 Tonners being Mynssen and Company. They were built in two batches of three and shipped from the factory between March and June 1890. There were minor differences between the locomotives of the two batches, the most notable being different footplate contours and buffer beams on the second batch. All six were equipped with 460 imperial gallons (2,090 litres) capacity water tanks.^[4]

Characteristics

The locomotives had inside cylinders, arranged at an incline, with slide valves which were actuated by Stephenson valve gear through rocker shafts. The cylinders and valve gear were placed between the plate frames and hidden from view by the wheels, which were coupled with external connecting rods. These were the only two-cylinder locomotives with an inside cylinder and valve gear arrangement to see service in South Africa.^[1]^[2]

Numbering conundrum

The engine numbers on record for the 18 Tonners are a source of some confusion. They were rostered on the NZASM in the number range from 9 to 14, following on from the NZASM 10 Tonner engine numbers. The Manning Wardle works records, however, listed them as being numbered in the Delagoa Bay Railway number range, from 53 to 58, following on from the engine numbers of the 10 Tonners, which also served on the Delagoa Bay Railway. Furthermore, a Manning Wardle builder's picture of an 18 Tonner shows it with the Delagoa Bay Railway engine number 57.^[1]^[4]^[5]

Similarly, in the works list of the Dutch manufacturer Machinefabriek Breda in respect of the 10 Tonners, those locomotives are also recorded with Delagoa Bay Railway engine numbers 50 to 52, instead of NZASM engine numbers 6 to 8.^[6]^[7]^[8]

It appears, therefore, that the 10 Tonners and 18 Tonners entered service on, or were at least delivered to, the Delagoa Bay Railway and were only rostered on the NZASM at a later stage.^[5]

The 10 Tonners and 18 Tonners were all delivered in 1890. At the time the first ones entered service in March and April 1890, the Randtram line, where the 10 Tonners were to be placed in service, had just been opened, with the first train being hauled by a 14 Tonner locomotive. However, the extensions of the Randtram line, towards the east to Springs and towards the west via Roodepoort to Krugersdorp, were still in progress. The extension from Germiston to Pretoria was only completed in December 1892, when a start was also made on the line from Pretoria to meet the approaching Delagoa Bay line, but Eerste Fabrieken in Pretoria East was only reached on 13 May 1894.^[3]

18 Tonner at work during the construction of the Brinkspruit bridge

From the Mozambique end, the bridge across the Komati river was only completed in July 1891, Nelspruit was only reached in June 1892, Waterval Boven two years later in June 1894 and the link-up with Pretoria was only completed at Balmoral in October 1894, more than four years after the 18 Tonners entered service.^[3]

Since they were used on construction work, it can therefore be surmised that the 18 Tonners were first placed in service on the Delagoa Bay Railway, hence the Delagoa Bay Railway engine numbers, from where they progressed towards Pretoria as the line was being built.^[1]

Whether this could have been the case with all six 18 Tonners as well as the 10 Tonners, or whether at least some of the 18 Tonners were used on construction work from the Pretoria end as well, is not known. The line from the Delagoa Bay end was completed all the way up to Waterval Boven on the Highveld at about the same time that the line from the Pretoria end reached Eerste Fabrieken in Pretoria East.^[3]

Service

Imperial Military Railways

All railway operations in the two Boer Republics, the ZAR and the Orange Free State, were taken over by the Imperial Military Railways (IMR) during the Second Boer War. The IMR renumbering register made provision for all six 18 Tonners, in the number range from 606 to 611. Three of them were later converted to stationary boilers no. 1592, 1593 and 1704.^[5]

Central South African Railways

At the end of the war, when the IMR was transformed into the Central South African Railways (CSAR), either one or two of the 18 Tonners survived and were renumbered, either as CSAR no. E or as numbers D and E. The uncertainty arises from the fact that the renumbering register lists CSAR no. D both as 14 Tonner no. 5 and as one of the 18 Tonner locomotives.^[8]

Industrial service

Two of the 18 Tonners were sold to industry, but neither was identified by engine number. One went to the Rand Collieries Schapenrust Coal Mines and was later sold again to Apex Colliery, where it was their no. 1. Another one went to Brakpan Mines, where it was their no. 2.^[5]

By the time the South African Railways classification and renumbering program was implemented in 1912, none of them were in railway service any longer.

Works numbers

The NZASM 18 Tonner works numbers, factory shipping dates and Delagoa Bay Railway, NZASM and IMR engine numbers are listed in the table.^[1]^[4]

**NZASM 18 Tonner 0-6-0T**
Works no.	Date shipped	Delagoa no.	NZASM no.	IMR no.
1177	000000001890-03-01-00001 Mar 1890	53	9	606
1178	000000001890-03-26-000026 Mar 1890	54	10	607
1179	000000001890-03-29-000029 Mar 1890	55	11	608
1186	000000001890-05-16-000016 May 1890	56	12	609
1187	000000001890-06-05-00005 Jun 1890	57	13	610
1188	000000001890-06-05-00005 Jun 1890	58	14	611

References

1 2 3 4 5 6 7 Holland, D.F. (1971). Steam Locomotives of the South African Railways, Volume 1: 1859-1910 (1st ed.). Newton Abbott, Devon: David & Charles. pp. 110–112. ISBN 978-0-7153-5382-0.
1 2 3 4 5 Espitalier, T.J.; Day, W.A.J. (1944). The Locomotive in South Africa - A Brief History of Railway Development. Chapter IV - The N.Z.A.S.M.. South African Railways and Harbours Magazine, October 1944. pp. 761-764.
1 2 3 4 5 6 The South African Railways - Historical Survey (Editor George Hart, Publisher Bill Hart, Sponsored by Dorbyl Ltd, Circa 1978, pp. 18-20.)
1 2 3 Harman, Fred W. (1999). The Locomotives Built by Manning Wardle & Company – Volume 1 Narrow Gauge, (1st ed.). Toddington, Beds: Century Locoprints. p. 51. ISBN 978-0953531301.
1 2 3 4 18 Tonner Information supplied by John Nicholas Middleton
↑ De Pater, A.D. (1970). The locomotives built by Machinefabriek "Breda" voorheen Backer & Rueb. Brill Archive. p. 54.
↑ Google books extract from The locomotives built by Machinefabriek "Breda" voorheen Backer & Rueb
1 2 10, 14 and 18 Tonner Information supplied by John Nicholas Middleton

Wikimedia Commons has media related to NZASM 18 Tonner (0-6-0ST).

Locomotives of the Central South African Railways

3' 6" gauge	CSAR 0-6-0ST 1896 CSAR 4-6-0T 1887 CSAR Class 6-L1 CSAR Class 6-L2 CSAR Class 6-L3 CSAR Class 7 CSAR Class 8-L1 CSAR Class 8-L2 CSAR Class 8-L3 CSAR Class 9 CSAR Class 10 1904 CSAR Class 10 1910 CSAR Class 10-2 Saturated CSAR Class 10-2 Superheated CSAR Class 10-C CSAR Class 11 CSAR Class B 0-6-4T CSAR Class C 2-8-4T CSAR Class D CSAR Class E 4-8-0TT CSAR Class E 4-8-2T CSAR Class E 4-10-2T CSAR Class F CSAR Class M CSAR Mallet Saturated CSAR Mallet Stoker CSAR Mallet Superheated CSAR Rack 4-6-4T CSAR Railmotor IMR 0-6-0ST 1896 IMR 4-6-0T 1887 IMR 46 Tonner 0-6-4T IMR 55 Tonner 2-6-4T IMR 7th Class 4-8-0 IMR 8th Class 4-8-0 IMR Reid Tenwheeler 4-10-2T IMR Western Australian 2-8-4T NZASM 10 Tonner NZASM 13 Tonner NZASM 14 Tonner NZASM 18 Tonner NZASM 19 Tonner NZASM 32 Tonner NZASM 40 Tonner NZASM 46 Tonner OVGS 1st Class 4-4-0TT OVGS 2nd Class 2-6-0 OVGS 2nd Class 2-6-0ST OVGS 3rd Class 4-4-0 OVGS 4th Class G 4-6-0 OVGS 5th Class K 4-6-0 1890 OVGS 5th Class K 4-6-0 1891 OVGS 6th Class L 4-6-0 OVGS 6th Class L2 4-6-0 OVGS 6th Class L3 4-6-0 PPR 0-4-0ST Natal PPR 26 Tonner PPR 35 Tonner Portuguese PPR 55 Tonner

2' gauge	CSAR Pankop

List of South African locomotive classes South African locomotive history

Locomotives of South Africa

Steam

7' ¼" gauge	East London Harbour 0-4-0 Table Bay Harbour 0-4-0ST Table Bay Harbour 0-4-0T Table Bay Harbour 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 Coffee Pot CGR 0-6-0ST 1902 CGR 0-6-0T 1876 Back-to-Back 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 1876 CGR 1st Class 4-4-0T 1875 CGR 2nd Class 4-4-0T 1882 CGR 3rd Class 2-6-0T CGR Railmotor CSAR Class C CSAR Class E CSAR Rack CSAR Railmotor DSWA Eight-Coupled Tank 2-8-0T Durban's Congella Durban's Edward Innes Durban's John Milne Durban's Sir Albert Port Elizabeth Harbour 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 0-4-0ST 1903 SAR 0-4-0T no. 69 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 Clayton

3' 6" gauge Tender engines	CGR 1st Class 2-6-0 1876 Beyer, Peacock 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 1879 CGR 1st Class 4-4-0TT 1881 CGR 2nd Class 2-6-2TT 1875 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 Joy 1882 CGR 4th Class 4-6-0TT 1884 CGR 5th Class 4-6-0 1890 CGR 5th Class 4-6-0 1891 DSWA Eight-Coupled Tender 2-8-0 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 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

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 0-6-0T 1871 Cape Copper Britannia Cape Copper Caledonia Cape Copper Clara Cape Copper Condenser Cape Copper Scotia Namaqua Copper Pioneer

2' & 600mm gauges	ACR Class NG-G16A CGR NG 0-6-0T CGR NG 4-6-2T CGR Type A 2-6-4T CGR Type C 0-4-0T DSWA Class Ha DSWA Class Hb DSWA Class Hc DSWA Class Hd DSWA Jung DSWA Zwillinge NGR Class N 4-6-2T SAR Dutton SAR NG 0-4-0T 1899 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

Electric

Amcoal Class E38

Gas-electric

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 SAR Class 36-000 SAR Class 36-200 SAR Class 37-000 Spoornet Class 39-000 TFR Class 35-800 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

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