South African Class 7F 4-8-0

This article is about one of two different New Cape Central Railway locomotive types to be designated "7th Class". For the other NCCR 7th Class locomotive, see South African Class 7E 4-8-0.

NCCR 7th Class 4-8-0 1913
South African Class 7F 4-8-0

300px NCCR 7th Class no. 10 SAR Class 7F no. 1358

Type and origin Power type Steam Designer Cape Government Railways (H.M. Beatty) Builder North British Locomotive Company Serial number 20217-20219 Model CGR 7th Class Build date 1913 Total produced 3

Specifications Configuration 4-8-0 (Mastodon) Driver axle 2nd coupled axle Gauge 3 ft 6 in (1,067 mm) Cape gauge Leading dia Coupled dia Tender wheels as built 34 in (864 mm) retyred Wheelbase 46 ft 6 in (14,173 mm)  • Engine  • Leading 5 ft 3 in (1,600 mm)  • Coupled 12 ft (3,658 mm)  • Tender 16 ft 1 in (4,902 mm)  • Tender bogie 4 ft 7 in (1,397 mm) Length:  • Over couplers Height 12 ft 10 in (3,912 mm) Frame type Plate Axle load  • Leading  • 1st coupled  • 2nd coupled  • 3rd coupled  • 4th coupled  • Tender bogie Bogie 1: Bogie 2:  • Tender axle Adhesive weight Loco weight Tender weight w/o Loco & tender weight w/o Tender type ZC (2-axle bogies) ZA, ZB, ZC, ZE permitted Fuel type Coal Fuel capacity 6 LT 10 cwt (6.6 t) Water cap Boiler:  • Pitch 7 ft 3 in (2,210 mm)  • Diameter 4 ft 6 in (1,372 mm)  • Tube plates 10 ft 9 in (3,277 mm)  • Small tubes 185:  • Firebox type Round-top Boiler pressure 180 psi (1,241 kPa) Safety valve Ramsbottom Firegrate area 17.5 sq ft (1.63 m2) Heating surface 1,095 sq ft (101.7 m2)  • Tubes 976 sq ft (90.7 m2)  • Firebox 119 sq ft (11.1 m2) Cylinders Two Cylinder size bore 23 in (584 mm) stroke Valve gear Stephenson Couplers Bell link-and-pin

Performance figures Tractive effort 22,240 lbf (98.9 kN) @ 75% Factor of adh 3.928

Career Operators New Cape Central Railway South African Railways Class NCCR 7th Class, SAR Class 7F Number in class 3 Numbers NCCR 9-11, SAR 1357-1359 Delivered 1913 First run 1913 Withdrawn 1940

The leading coupled axle had flangeless wheels

The South African Railways Class 7F 4-8-0 of 1913 was a steam locomotive.

In 1913, the New Cape Central Railway placed three Cape 7th Class 4-8-0 Mastodon type steam locomotives in service. In 1925, when the New Cape Central Railway was amalgamated into the South African Railways, these three locomotives were renumbered and reclassified to Class 7F.

New Cape Central Railway

The New Cape Central Railway (NCCR) was formed in January 1893, when it purchased all the assets of the bankrupted Cape Central Railway (CCR), which had constructed a line from Worcester via Robertson to Roodewal, now Ashton. In 1894 the NCCR began work to extend the line to Swellendam. From there it continued via Heidelberg to Riversdale, which was reached on 3 December 1903. Voorbaai, near Mosselbaai, was reached in 1904.

Unlike most other privately owned railways in South Africa, the NCCR prospered and was well and efficiently run. Prior to 1917, dividends were small, but from 1917 to 1925, dividends of 4½% were declared each year. The NCCR was the last component railway to be added to the South African Railways (SAR), when it was liquidated and amalgamated in May 1925. All the NCCR locomotives which came onto the SAR roster, continued to give good service for many years.

Manufacturer

These last three NCCR 7th Class locomotives were ordered from and built by the North British Locomotive Company (NBL) in 1913, numbered in the range from NCCR 9 to 11.

Characteristics

The original Cape 7th Class had been designed in 1892 by H.M. Beatty, Cape Government Railways (Western System) Locomotive Superintendent. While there was little difference from the original 7th Class design as far as the main dimensions were concerned, these three locomotives were more modern in appearance. They were more powerful, with a higher boiler pressure of and bore cylinders instead of the 17 inches (432 millimetres) bore of all but one (the Class 7C) of the earlier models.

File:H.M. Beatty.jpg

H.M. Beatty

Other differences were the boiler centre line, which was raised to 7 feet 3 inches (2,210 millimetres), a boiler diameter which was increased to 4 feet 6 inches (1,372 millimetres), the total boiler heating surface which was increased to 1,095 square feet (101.7 square metres), tractive effort which was increased to 22,240 pounds-force (98.9 kilonewtons) and a factor of adhesion which was reduced to 3.928.

Visually obvious alterations were the smokebox saddle and the running boards. The distinctive covered smokebox saddle of earlier 7th Class locomotives was replaced with an exposed one. The running boards were no longer straight all the way through from buffer beam to cab end, but dipped ahead of the smokebox and beneath the cab, giving it the appearance of a Hendrie-designed locomotive.

These locomotives were capable of hauling 180 long tons (180 tonnes) from Ashton to Mosselbaai.

Class 7 sub-classes

When the NCCR was amalgamated into the SAR in 1925, these three 7th Class locomotives were renumbered in the range from 1357 to 1359 on the SAR roster and designated Class 7F.

Other 7th Class locomotives which had come onto the SAR roster from the other railways in the Southern African region in 1912, namely the Cape Government Railways (CGR), Central South African Railways (CSAR), the Natal Government Railways (NGR) and the Rhodesia Railways (RR), as well as earlier NCCR 7th Class locomotive models, were grouped into six different sub-classes by the SAR, becoming SAR Classes 7 and 7A to 7E.

Service

In SAR service, the Class 7 family did duty on every system in the country. They remained in branchline service, particularly at Tarkastad and Ladysmith and also on the branchline from Touws River to Ladismith, until the last ones were withdrawn in 1972. The Class 7F, however, had a shorter life span and all three locomotives were withdrawn by 1940.