LNER Class A4 4468 Mallard Totally Explained

Everything about Lner A4 Class 4468 Mallard totally explained

Number 4468 Mallard is a London and North Eastern Railway Class A4 4-6-2 Pacific steam locomotive built at Doncaster, England in 1938. Mallard was designed by Sir Nigel Gresley as an express locomotive specially built to power high-speed streamlined trains. Its wind-tunnel-tested, aerodynamic body allowed it to reach speeds of over 100 mph (160 km/h). Mallard was in service until 1963, when it was retired, having covered almost one and a half million miles (2.4 million km).
It was restored to working order in the 1980s, but hasn't operated since, apart from hauling some specials between York and Scarborough in July 1986 and a couple of runs between York and Harrogate/Leeds around Easter 1987. Mallard is the only surviving A4 in LNER livery and in as-built original condition with side valances (although the valances are replicas). Mallard is now part of the National Collection at the United Kingdom's National Railway Museum in York.
The locomotive is 70 ft long and weighs 165 tons, including the tender. It is painted LNER garter blue with red wheels and steel rims.

The Record

Mallard is the holder of the world speed record for steam locomotives at 126 mph (202.7 km/h). The record was achieved on July 3, 1938 on the slight downwards grade of Stoke Bank south of Grantham on the East Coast Main Line, and the highest speed was recorded at milepost 90¼, between Little Bytham and Essendine. It broke the German (DRG Class 05) 002's 1936 record of 124 mph (200.4 km/h). Mallard was the perfect vehicle for such an endeavour; one of the A4 class of streamlined locomotives designed for sustained 100+ mph (160 km/h) running, it was one of a small number equipped with a double chimney and double Kylchap blastpipe, which made for improved draughting and better exhaust flow at speed. The A4's three-cylinder design made for stability at speed, and the large 6 ft 8 in (2.032 m) driving wheels meant that the maximum revolutions per minute was within the capabilities of the technology of the day. Mallard was five months old, meaning that it was sufficiently run-in to run freely, but not overly worn. Selected to crew the locomotive on its record attempt were driver Joseph Duddington (a man renowned within the LNER for taking calculated risks) and fireman Thomas Bray.
The locomotive had had problems with the middle big end previously, so a "stink bomb" of aniseed oil was placed inside the big end, that would be released if it overheated. Shortly after the attainment of this record speed, Mallard suffered an overheated inside big end bearing and had to limp back to Peterborough after setting the record, it then travelled to Doncaster for repair. This had been foreseen by the publicity department, who had many pictures taken for the press, in case Mallard didn't make it back to Kings Cross. The Ivatt Atlantic that replaced Mallard at Peterborough was only just in sight when the head of publicity started handing out the pictures. Inaccuracies in the machining and setup of the Gresley-Holcroft derived motion (which derived the valve motion of the inside cylinder from those of the other two, avoiding a hard-to-maintain valve gear linkage between the frames) meant that the inside cylinder of the A4 did more work at high speed than the two outside cylinders; this overloading was mostly responsible for the failure.
Stoke Bank had a descending gradient of between 1:178 and 1:200. Mallard, with six coaches plus a dynamometer car in tow, topped Stoke Summit at 75 mph (121 km/h) and began to accelerate downhill. The speeds at the end of each mile (1.6 km) from the summit were recorded at: 87½, 96½, 104, 107, 111½, 116 and 119 mph (141, 155, 167, 172, 179, 187 and 192 km/h); half-mile (800 m) readings after that gave 120¾, 122½, 123, 124¼ and finally 125 mph (194, 197, 198, 200 and 201 km/h). The speed recorded by instruments in the dynamometer car reached a momentary maximum of 126 mph (203 km/h).

Rival claims

Mallard's world record has never been officially exceeded by a steam locomotive, though German locomotives came very close (in 1936, two years before Mallard's run, a Class 05 loco reached 200.4 km/h (124.5 mph) between Hamburg and Berlin). Many rumours and stories exist of higher speeds, but Mallard's is the only one with adequate documentation. Other steam locomotives were probably capable of such speeds; the LNER's long, straight, slightly downhill raceway of Stoke Bank played a part in the record. The 1936 run of the German Class 05 was on a horizontal stretch of track although speed was built up on a preceding down-hill section.
It is notable that, unlike world records for cars, there's no requirement for an average of two runs in both directions, and assistance from gradient or wind has always been acceptable in rail speed records. Other locomotives that may have exceeded the 126 mph (203 km/h) record include the Pennsylvania Railroad's mighty S1 prototype which is rumoured to have reached 140 mph (225 km/h), although the claim is disputed, and the Milwaukee Road class F7. The Milwaukee Road had the fastest scheduled steam-powered passenger trains in the world. Both it and the Chicago & North Western had timetables requiring running in excess of 100 mph (160 km/h); it's known that both railroads' locomotives often exceeded 120 mph. The belief is that—as far as can be ascertained—fear of lawsuits, and of a reputation for risk-taking through record runs, scared all U.S. railroad companies away from official record attempts in the 1930s and 1940s, in marked contrast to the constant record claims of previous decades.
One fact that's often ignored when considering rival claims is that Gresley and the LNER had just one serious attempt at the record, which was far from a perfect run with a permanent way check through Grantham. Despite this a record was set. Gresley is understood to have been planning another attempt in 1939, but this was prevented by the outbreak of World War II. People have claimed Gresley believed that 130mph was possible.
Thus, Mallard still holds the crown; plaques affixed to each side of the locomotive commemorate the feat.

1948 Locomotive Exchange Trials

In 1948, shortly after the formation of British Railways, the decision was taken to test locomotives from all of the former 'Big Four' companies to find the best attributes of speed, power and efficiency with coal and water. There were two ways of testing and comparing locomotives: either at the Rugby Locomotive testing plant, which wasn't ready until late 1948, or by testing in the field itself. The results of these trials would be used to help design the British Railways Standard design of locomotives.
The express passenger locomotive designs which would be compared were: London Midland Region Princess Coronation class, Eastern Region Class A4, Southern Region Merchant Navy and Western Region King class.
Three Gresley A4 locomotives were chosen to represent the Eastern Region: E22 Mallard, 60033 Seagull and 60034 Lord Farringdon. All of the locomotives had the Kylchap double blastpipe chimney arrangement and were fresh from Doncaster works. Mallard had emerged from Doncaster with a fresh coat of post-war garter blue livery, stainless steel numbers 22 with a small 'E' painted above them (for Eastern region), new boiler (her fourth) and third tender of her career. June 8th 1948 saw E22 Mallard used on the Waterloo-Exeter route. Driver Marrable took the famous A4 with a load of 481 tons tare, 505 tons full, the same that had been used on the previous trip by 35018 British India Line. Mallard got through Clapham Junction in 6 minutes 57 seconds, Woking in 28 minutes 47 seconds. At Hook there were adverse signals, causing Mallard to slow to a crawl. Even so, by Axminster, Mallard had reached 82 miles per hour. Salisbury was reached in 108 minutes and 28 seconds. Despite the signals earlier, the train was only 5-and-a-half minutes late. The net time was 95.5 minutes. Mallard failed after this trial and 60033 Seagull took over. June 10th saw Seagull achieve the run in 96 minutes 22 seconds, but had departed 3 minutes late, meaning Seagull had arrived with the same load 3.5 minutes early. For Mallard, the 1948 Locomotive Exchange Trials were over, but Mallard was to return to the Waterloo-Exeter line for a Locomotive Club of Great Britain (LCGB) railtour in February 24th 1963.

Technical Specifics

Mallard was released into traffic for the first time on March 3rd 1938. She was the first A4 to be fitted with a Kylchap double blast pipe from new. This was one of the features that would shortly select her for the attempt on the world rail speed record in the following July. Mallard wore a variety of liveries throughout her career, these were: garter blue as 4468, LNER wartime black from June 13th 1942, later wartime black with the tender marked as "NE" from October 21st 1943 as 22 with yellow small stencilled numbers, post-war garter blue with white and red lining from March 5th 1948 with stainless steel cabside number 22, British railways dark blue as 60022 from September 16th 1949, brunswick green from July 4th 1952 and regaining her original LNER garter blue for preservation in 1963.
As with all 35 of the Gresley A4 pacific steam locomotives, Mallard was fitted with streamlines valances, or side skirting, when she was built. This was found to hinder maintenance and, like her sisters, it was removed. 4468 lost her valances during a works visit June 13th 1942, regaining them in preservation in 1963. Mallard was fitted with twelve boilers during her 25 year career. These boilers were: 9024 (from construction), 8959 (from 4496 Golden Shuttle, June 13th 1942), 8907 (from 2511 Silver King, August 1st 1946), 8948 (from 31 Golden Plover, March 5th 1948), 8957 (from 60009 Union of South Africa, September 16th 1949), 29282 (from 60028 Walter K Whigham, January 10th 1951), 29301 (from 60019 Bittern, July 4th 1952), 29315 (from 60014 Silver Link, April 23rd 1954), 29328 (new-build boiler, June 7th 1957), 29308 (from 60008 Dwight D. Eisenhower, August 27th 1958), 29310 (from 60009 Union of South Africa, March 9th 1960) and 27965 (from 60009 Union of South Africa, August 10th 1961). Mallard has had seven tenders throughout her career. She started off with a non-corridor tender in 1938, had corridor design tenders during her British Railways days and was fitted with a non-corridor tender in 1963 to recreate her original appearance. The tenders she's been fitted with are: 5642 (March 3rd 1938 - March 14th 1939), 5639 (May 5th 1939 - January 16th 1948), 5323 (March 5th 1948 - March 12th 1953), 5648 (March 12th 1953 - July 21st 1958), 5330 (August 27th 1958 - May 30th 1962), 5651 (May 30th 1962 - April 25th 1963) and 5670 (current tender, masquerading as original tender 5642). Mallard was allocated to three sheds during her career: Doncaster, Grantham (transferring October 21st 1943) and Kings Cross ('Top Shed'), transferring on April 11th 1948.

In Fiction

Mallard appears in The Railway Series book Thomas and the Great Railway Show, at the National Railway Museum at York.
It is featured in the second and third sequels of the successful videogames series Railroad Tycoon.
In the first season of the TV series NCIS, in the episode "Bête Noire" a terrorist who invades NCIS headquarters and Doctor Mallard discuss the "Mallard" and its speed record in the opening moments of the episode.

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