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South African Class 26 4-8-4
African Railways Class 26 4-8-4 of
1981, popularly known as the Red
is a 4-8-4 steam
was rebuilt from a Class 25NC locomotive by mechanical engineer David
Wardale from England while
in the employ of the South
The rebuilding took place at the Salt River Works in Cape Town and
was based on the principles developed by Argentinian mechanical
The original locomotive from which the Class 26 was rebuilt entered service in 1953 as the last of the Class 25NC 4-8-4 Northern type locomotives to be built. The Class 25 condensing and Class 25NC non-condensing locomotives were designed by the South African Railways (SAR) under the direction of L.C. Grubb, Chief Mechanical Engineer of the SAR from 1949 to 1954, and in conjunction with Henschel and Son. The first Class 25, no. 3451, most of the Class 25 condensing tenders and Class 25NC locomotives in the number range from 3412 to 3450 were built by Henschel, while Class 25NC locomotives in the number range from 3401 to 3411 and the other eighty-nine Class 25 condensing locomotives were built by the North British Locomotive Company in Glasgow, Scotland.
Class 19D trial rebuilding
The rebuilding project suffered from the outset from, at best, half-hearted support on the side of the SAR management who had by then already decided to replace all steam traction with electric and diesel-electric power.
Wardale, however, was determined to demonstrate that the efficiency of steam locomotives could be drastically increased by making use of a Gas Producer Combustion System (GPCS) to produce more steam for less fuel consumed, and the Lempor exhaust system developed by Argentinian mechanical engineer L.D. Porta to use steam with maximum efficiency.
As a trial run, Wardale was allowed to carry out extensive modifications on a Krupp-built Class 19D 4-8-2 Mountain type branchline locomotive, no. 2644. A GPCS and tandem dual Lempor exhausts were installed along with some other small improvements which included high mounted smoke deflectors.
The modifications enabled the locomotive to achieve significantly higher power and lower fuel consumption than other unmodified Class 19Ds, which resulted in Wardale being allowed to continue with the building of a Class 26 prototype.
Red Devil rebuilding
Work on Class 25NC no. 3450 began at the end of 1979. The manufacturing of all new items and modifications to existing parts were carried out at the SAR workshops at Salt River in Cape Town, Bloemfontein, Beaconsfield in Kimberley, Koedoespoort in Pretoria and Pietermaritzburg, the work being allocated to the workshop best suited to the particular task at hand.
The primary objectives of the modifications were threefold.
To improve the combustion and steaming rate.
To reduce the emission of wasteful black smoke.
To overcome the problem of clinkering.
This was achieved by the use of a single-stage gas producer, the GPCS, which relies on the gasification of coal on a low temperature firebed so that the gases are then fully burnt above the firebed. It minimises the amount of air being drawn up through the firebed, the main source of air required for combustion being through ancillary air intakes located above the firebed.
The most serious waste of fuel in a conventional steam locomotive is the loss of unburned coal particles from the fuel bed because of the rapid flow of air through the grate. With the GPCS, the coal is therefore heated to drive off the volatile components which are then burned in the secondary air admitted above the grate. The result is improved combustion, thereby minimising black smoke, which is evidence of incomplete combustion with the result that unburnt coal particles are ejected through the exhaust.
Amongst many minor detail improvements, other major modifications to the engine included the following:
A lengthened smokebox to accommodate the tandem double Lempor exhausts.
Offset double chimneys.
A feedwater-heater between the chimneys.
Improved lubrication on cylinder and valve liner rubbing surfaces.
A booster for increased superheating.
New piston valves.
Articulated valve spindles.
New cooled valve liners.
Redesigned chromium cast iron rings and valve liners with streamlined cylinder ports.
New cylinder liners.
Altered valve gear.
Herdner starting valves.
An altered self-cleaning smokebox.
Enlarged steam chests.
Direct steam pipes.
Improved valve and piston rod packings.
An improved variable stroke lubricator drive.
Improved Walschaerts valve gear with computer calculated dimensions.
Continental European style high mounted exhaust deflectors, curved round but not parallel to the smokebox.
The coal capacity of the Class 25NC's Type EW1 tender was increased from 18 long tons (18.3 tonnes) to about 20 long tons (20.3 tonnes) by raising the coal bunker sides.
With all the modifications done, the total weight of the locomotive in full working order had been increased from 231 tonnes (227 long tons) to about 236 tonnes (232 long tons).
These extensive modifications justified reclassification and the locomotive became the first and only Class 26, although its original Class 25NC number 3450 was retained. The Class 26 number plates, builder's plate and the Salt River rebuild plate which were attached to the cab sides at the time, have since been replaced with plates inscribed "Transnet National Collection".
The Henschel works plates which were mounted on the cab sides of 3450 were not the originals, but were taken off Class GMAM 4-8-2+2-8-4 Garratt no. 4068, Henschel works number 28697, which was withdrawn from service and stored at De Aar at about the time no. 3450 was being rebuilt to Class 26. The Red Devil's actual builder's works number, 28769, had the same digits, albeit in a different order.
The locomotive was painted in a red livery and was officially named L.D. Porta after the Argentinian engineer responsible for some of the ideas and developments incorporated in its modification. Initial steaming and yard running took place on Thursday 5 February 1981 and the first test trip, running light from Salt River to Bellville and back, took place the following day. On Monday 9 February the rebuilt no. 3450 hauled its first three-coach train filled with various railway officials, staff and media representatives to Dal Josafat, about 66 kilometres (41 miles) from Cape Town. In subsequent Cape Town press reports the locomotive was dubbed the Red Devil. The nickname eventually became official and the locomotive now bears it on the Class 25NC type exhaust deflectors which later replaced the Continental European style exhaust deflectors.
Compared to an unmodified Class 25NC, the Red Devil achieved a 28% measured saving on coal and a 30% measured saving on water, measured during freight service, and a 43% increase in drawbar power based on the maximum recorded drawbar power. Its approximate maximum range in full-load freight service on 1% to 1¼% grades is 700 kilometres (430 miles) based on its coal capacity, and 230 kilometres (140 miles) based on its water capacity.
The drawbar figures were extremely conservatively calculated. Using both mechanical and electronic indicating equipment, the Class 26 recorded 4,492 indicated horsepower (3,350 kilowatts) on tests between Pretoria and Witbank, a world record for a narrow gauge locomotive. According to the dynamometer car, this was then developing 3,787 equivalent drawbar horsepower. However, the drawbar outputs were measured with less accuracy owing to the malfunctioning of the dynamometer car, which gave generally inconsistent results throughout the various tests made. The equivalent drawbar outputs were unacceptably low relative to the indicated ones and gave an unrealistically high locomotive rolling resistance. The highest recorded equivalent drawbar power of 3,787 horsepower (2,824 kilowatts) at 74 kilometres per hour (46 miles per hour) is therefore most probably lower than that which was actually achieved, but even this low figure is 43% higher than that which was possible with the Class 25NC, exceeding the original claim of a 35% increase. Extrapolating the conservative maximum equivalent drawbar power-speed curve predicts 3,000 kilowatts (4,000 horsepower) at 100 kilometres per hour (62 miles per hour), 52% higher than the 25NC maximum.
The Red Devil's rated freight loads are 700 tonnes (690 long tons) on 2% grades, 1,080 tonnes (1,060 long tons) on 1¼% grades and 1,320 tonnes (1,300 long tons) on 1% grades. The maximum recorded freight load hauled relative to gradient was 900 tonnes (890 long tons) on 2% grades, and it can haul a 650 tonnes (640 long tons) passenger train at a constant speed of 100 kilometres per hour (62 miles per hour) on 1% grades.
The Red Devil's great power, however, also turned out to be its one weakness. The Class 25NC had already proven to be on the slippery side and the much more powerful Class 26, with essentially still the same dimensions as the Class 25NC, was even worse. It was a poor performer at starting or at low speeds on steep gradients. On its first working run from Pretoria to Witbank in Transvaal, a signal stop on a 1 in 50 (2%) gradient resulted in great struggles to restart, eventually causing about twenty minutes delay. Neither the Herdner valves nor the air sanding seemed able to overcome these problems.
SAR Class 26 Red Devil Steam locomotive 4-8-4
- Brand: Mini World Models (South Africa)
- Product Code: SAR Class 26 Red Devil Steam locomotive 4-8-4
- Availability: 2-3 Days
Tags: SAR Class 26 Red Devil Steam locomotive 4-8-4