The South African type MR tender was a steam locomotive tender.
Type MR tenders were rebuilt from
Type MP1 tenders, which had entered service between 1912 and 1920. The rebuilding resulted in a tender with a larger water tank, but the same coal capacity.
[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. 42.][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, 42.]
Origin
The Type MP1 tender first entered service in 1912, as tenders to the Mountain type steam locomotives which were acquired by the
South African Railways (SAR) in that year. They were built by
North British Locomotive Company
The North British Locomotive Company (NBL, NB Loco or North British) was created in 1903 through the merger of three Glasgow locomotive manufacturing companies; Sharp, Stewart and Company (Atlas Works), Neilson, Reid and Company (Hyde Park Wor ...
and
Beyer, Peacock & Company
Beyer, Peacock and Company was an English railway locomotive manufacturer with a factory in Openshaw, Manchester. Founded by Charles Beyer, Richard Peacock and Henry Robertson, it traded from 1854 until 1966. The company exported locomotives, ...
.
More Type MP1 tenders, from which the Type MR would later be rebuilt, entered service from 1913 to 1920 as tenders to the
Classes 12A,
12B
''12B'' is a 2001 Indian Tamil language, Tamil-language romance film directed and written by cinematographer Jeeva (director), Jeeva; it is his directorial debut. The film stars Shaam (actor), Shaam in his debut, with Simran (actress), Simran a ...
,
14A,
14B,
15,
15A,
16,
16A,
16B and 16C. These locomotives and tenders were built by
Baldwin Locomotive Works
The Baldwin Locomotive Works (BLW) was an American manufacturer of railroad locomotives from 1825 to 1951. Originally located in Philadelphia, it moved to nearby Eddystone, Pennsylvania, in the early 20th century. The company was for decades t ...
, Beyer, Peacock & Company,
Henschel & Son
Henschel & Son (german: Henschel und Sohn) was a German company, located in Kassel, best known during the 20th century as a maker of transportation equipment, including locomotives, trucks, buses and trolleybuses, and armoured fighting vehic ...
,
JA Maffei and North British Locomotive Company.
Other locomotives which were delivered new with Type MP1 tenders were the
Classes 14,
MC1,
MH and MJ.
Rebuilding
During the 1930s, several of the Type MP1 tenders were rebuilt by the SAR by mounting a completely new upper structure with a larger water tank on the existing underframe. The modification was done to drawings approved by Chief Mechanical Engineer (CME) A.G. Watson in 1929 in respect of Type MP1 tenders of the Classes 12, 12A, 12B, 14, 14A, 14B, 15, 15A, 16, 16A, 16B and 16C. These rebuilt tenders had a more modern appearance, with flush sides all the way to the top of the self-trimming coal bunker.
[SAR&H Mechanical Department. ''Alteration of Tender to Self Trimming Coal Bunker Type - Class 12, 12A, 12B, 14, 14A, 14B, 15, 15A, 16, 16A, 16B, 16C''. SAR Mechanical Department Drawing Office, Drawing L-6780/1, 7 April 1929.]
The program to rebuild several older tender types with new upper structures was begun by Col F.R. Collins
DSO, who approved several of the detailed drawings for the work during his term in office as CME of the SAR from 1922 to 1929.
[SAR Mechanical Department. ''New Tender Tank - Class 6B, 6E (XE), 7A, 7B, 7C (ZE)''. SAR Mechanical Department Drawing Office, Drawing L-5618, 1925.]
Characteristics
The rebuilt Type MR tender had the same coal capacity as the Type MP1, but its water capacity had been increased from . It had a maximum axle load of .
Classification letters
Since many tender types are interchangeable between different locomotive classes and types, a tender classification system was adopted by the SAR. The first letter of the tender type indicates the classes of engines to which it could be coupled. The "M_" tenders could be used with the locomotive classes as shown, although engine drawbars and intermediate emergency chains had to be replaced or adjusted to suit the target locomotive in some cases.
*
Class 12,
Class 12A and
Class 12B.
*
Class 14,
Class 14A and
Class 14B
Class or The Class may refer to:
Common uses not otherwise categorized
* Class (biology), a taxonomic rank
* Class (knowledge representation), a collection of individuals or objects
* Class (philosophy), an analytical concept used differently ...
.
*
Class 15 and
Class 15A.
*
Class 16,
Class 16A,
Class 16B and
Class 16C.
*
Class 19 Class 19 may refer to:
* Caledonian Railway 19 Class, 0-4-4T steam locomotives
* Belgian Railways Class 19, electric locomotives
* British Rail Class 19
Class 19 is the name given to an experimental railway locomotive that was constructed using ...
,
Class 19A,
Class 19B,
Class 19C and
Class 19D.
*
Class 20.
*
Class 24.
*
Class MC1,
Class MH and
Class MJ.
*
Class S2.
The second letter indicates the tender's water capacity. The "_R" tenders had a capacity of .
Illustration
File:SAR Class 14R 1907 Klerksdorp 170478.jpg, Type MR on SAR Class 14R, 1978
References
{{Locomotives of South Africa
MR