South African type TM tender
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The South African type TM tender was a steam locomotive tender from the pre-Union era in the Natal Colony.
The Type TM tender first entered service in 1910, as tenders to a second batch of 25 Class B 4-8-2 Mountain type steam locomotives which were ordered by the Natal Government Railways in that year. These locomotives were designated Class 3 on the South African Railways in 1912.[1][2][3]
Contents
Manufacturers
Type TM tenders were built between 1910 and 1912 by the North British Locomotive Company (NBL).[1][4]
The Natal Government Railways (NGR) placed its second batch of 25 Class B Mountain type locomotives in service in 1911. The locomotive and tender were designed by NGR Locomotive Superintendent D.A. Hendrie and built by NBL. Known as the Hendrie D, but officially designated Class B on the NGR, it was the first true Mountain type locomotive in the word.[1][2][3]
The Type TM first entered service as tenders to these 25 locomotives. More entered service on the South African Railways (SAR) in 1912, as tenders to the ten SAR Class 3B 4-8-2 Mountain type and ten SAR Class MC 2-6-6-0 Denver type Mallet locomotives. These locomotives were also built by NBL.[2][3][4][5]
Classification
Since many tender types are interchangeable between different locomotive classes and types, a tender classification system was adopted by the SAR and these tenders were designated Type TM.[1][3][4][6]
During the classification and renumbering of locomotives onto the SAR roster in 1912, no separate classification and renumbering list was published for tenders, which should also have been renumbered according to the locomotive renumbering list. In most cases, an oval number plate, bearing the engine number and tender type, was attached to the rear end of the tender. Three locomotive classes were delivered new with Type TM tenders, which were numbered or renumbered for their engines in the SAR number blocks as shown.[1][3][4][6]
- 1910: NGR Class B 4-8-2 of 1909, SAR Class 3, numbers 1451 to 1475.
- 1912: SAR Class 3B, numbers 1479 to 1488.
- 1912: SAR Class MC, numbers 1607 to 1616.
Letter codes
The first letter of the tender type indicates the classes of engines to which it can be coupled. The "T_" tenders could be used with the locomotive classes as shown below, although engine drawbars had to be replaced to suit the target locomotive in some cases. To couple Type TM tenders off the Class MC to the Classes 3 and 3B, the engine drawbar had to be Lua error in Module:Convert at line 452: attempt to index field 'titles' (a nil value). long, and a drawbar had to be fitted to suit to couple any Type TM tender to Class 1A engines.[3]
- NGR Class B 4-8-0 of 1910, SAR Class 1A
- NGR Class A 4-6-2 of 1910, SAR Class 2C
- NGR Class B 4-8-2 of 1909, SAR Class 3
- SAR Class 3B
- SAR Class MC
The second letter indicates the tender's water capacity. The "_M" tenders had a capacity of Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value)..[3]
A number, when added after the letter code, indicates differences between similar tender types, such as wheelbase or coal bunker capacity.[3]
Modification and rebuilding
Modification
At some stage before 1941, the intermediate draw and buffing gear of two of the tenders, numbers 1607 and 1615 off Class MC Mallet locomotives, were altered to an "X_" tender configuration. These tenders were reclassified to Type XM1.[3]
Rebuilding
Between 1912 and 1941, probably c. 1930, some Type TM tenders were rebuilt by the SAR, by mounting a completely new upper structure on the existing underframe. These rebuilt tenders were designated Type TL. The rebuilding resulted in a tender with a Lua error in Module:Convert at line 1851: attempt to index local 'en_value' (a nil value). smaller water tank and 10 long hundredweight (0.5 tonnes) larger coal bunker. The Type TL had a more modern appearance, with smooth sides all the way to the top.[2][3]
References
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- ↑ 1.0 1.1 1.2 1.3 1.4 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 South African Railways & Harbours/Suid Afrikaanse Spoorweë en Hawens (15 Aug 1941). Locomotive Diagram Book/Lokomotiefdiagramboek, 3'6" Gauge/Spoorwydte. SAR/SAS Mechanical Department/Werktuigkundige Dept. Drawing Office/Tekenkantoor, Pretoria. p. 43.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 South African Railways & Harbours/Suid Afrikaanse Spoorweë en Hawens (15 Aug 1941). Locomotive Diagram Book/Lokomotiefdiagramboek, 2'0" & 3'6" Gauge/Spoorwydte, Steam Locomotives/Stoomlokomotiewe. SAR/SAS Mechanical Department/Werktuigkundige Dept. Drawing Office/Tekenkantoor, Pretoria. pp. 6a-7a, 44.
- ↑ 4.0 4.1 4.2 4.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 6.0 6.1 Classification of S.A.R. Engines with Renumbering Lists, issued by the Chief Mechanical Engineer’s Office, Pretoria, January 1912 (Reprinted in April 1987 by SATS Museum, R.3125-6/9/11-1000)
