English railway engineer (1881–1954)
Edward Thompson (25 June 1881 – 15 July 1954) was an English railway engineer, and was Chief Mechanical Engineer of the London and North Eastern Railway between 1941 and 1946. Edward Thompson was born at Marlborough, Wiltshire on 25 June 1881. He was the son of Francis Thompson, assistant master at Marlborough College. He was educated at Marlborough before taking the Mechanical Science Tripos at Pembroke College, Cambridge, earning a third class degree. Thompson entered the railway scene after education, contrasting that of his predecessor Nigel Gresley, who had also attended Marlborough after gaining practical experience as a pupil at Horwich Works.
Biography.
Edward Thompson was born in Marlborough, Wiltshire to Francis Thompson. His grandfather Francis ran a tailoring business in London. 
He would be educated at Marlborough College, same as his predecessor. After education at Marlborough, he would attend Pembroke College and be influenced by Sir George Stokes, ultimately graduating with a third class degree. 
Pre-grouping Career.
After graduation Thompson worked in both industry and the railways for a while. He worked as a pupil at Beyer, Peacock's drawing office, before moving to work at the Midland Railway's Derby shed. By 1910 he was assistant divisional locomotive superintendent on the North Eastern Railway (NER), in which capacity he gave evidence at the inquiry into the fatal accident between two goods trains at Darlington on 15 November 1910. In 1912 he was appointed Carriage and Wagon Superintendent at Doncaster for the Great Northern Railway (GNR). He served with the Armed Forces during WW1, and was twice mentioned in dispatches, and awarded OBE, Military Division for action at the Battle of Passchendaele. 
Upon demobilization, he returned to the railways, alternating between the wagon works at Darlington and Doncaster, and consequently between the North Eastern and Great Northern respectively. In 1920 he returned to the NER at York as Carriage and Wagon Superintendent, and joined the LNER upon grouping. He became Workshop Manager at Stratford Works in 1930 and was able to make significant improvements although the works layout prevented major changes there. He would become a Mechanical Engineer at Darlington and Doncaster in 1934 and 1938 respectively, before becoming Chief Mechanical Engineer (CME) of the London and North Eastern Railway (LNER) in 1941 after the death of Nigel Gresley.
Edward Thompson would marry Guendolen Raven, daughter of Sir Vincent Raven, CME of the North Eastern Railway. After Guen's death in 1938, he subsequently became very lonely.
During World War Two, he met Richard Hardy by chance, who was working on the footplate of a locomotive without permission. He was fond of the boy and the two boarded a train to Doncaster, where Thompson spoke to him with great enthusiasm about ongoing projects. Richard Hardy would join the LNER and become part of Thompson's design team. 
Wartime CME.
When Thompson was appointed CME of the LNER, he became in charge of a railway which had a greatly reduced labour force and foundry capacity. To remedy this, he sought to start a much needed standardisation programme out of an urgent need for simplicity. The LNER was continuing to operate almost 5,000 locomotives across 160 classes from pre-grouping companies, many of which were aging and unreliable. He intended to reduce the number of locomotive classes from 160 to just 19 classes by scrapping or removing most of the pre-grouping era locomotives of the LNER. Some believed that in doing so, he intended to "rid the LNER of Gresley", when in reality he sought to retain most of his predecessor's work.
The standardisation was a further reflection on the difference between Gresley and Thompson. The LNER had never been in a position to undergo large-scale re-equipment programmes such as those afforded by the LMS, and for much of its existence, the LNER used a large fleet of pre-grouping locomotives for everything except the very top-flight services. As such, Gresley believed that rebuilding and improving was usually enough in a lot of cases, and where it was not, he designed a locomotive specifically for the job. Examples of each are the D16/3 Claud Hamiltons (rebuilt), the B12/3 (re-boilered and new valve gear) and his K4 (built for the West Highland Line) and P2 (for the Aberdeen to Edinburgh route). Thompson instead advocated for constructing and maintaining a small variety of classes, and spent time during his tenure as CME in developing a list of classes either to be maintained (A10, A3, A4 etc.), rebuilt to his standard (B2, A2/2, K1/1 etc.) or built to new standard designs (B1, L1 etc.).
The programme had the desired effect of reducing the variety of LNER classes, and allowed the withdrawal of a number of elderly and worn out pre-grouping Atlantics, 4-6-0 and more. However, the number of locomotive classes and boilers did not change significantly until after he had left office. While his goals are correct, his short time in office limited the successes that he may have.
Retirement and Death.
Edward Thompson retired in June 1946 after holding the post for 5 years at an age of 65 and was succeeded by Arthur Peppercorn. The first locomotive of his final design, the A2/3, entered traffic on 24 May and was named after its designer, coincidentally as the 2,000th engine constructed at Doncaster. At the naming ceremony, Sir Ronald Matthews paid tribute to the departing CME, thanking him for his service to the company through difficult wartime situation.
After retirement, he would regularly attend the Institute of Mechanical Engineers, the MCC and the Oxford and Cambridge University Club at Pall Mall.He would attend lectures at IME, but did not comment, research or present papers himself. He maintained his friendship with other CMEs, such as William Stanier, both of which congratulated each other over new locomotives such as their respective mixed traffic designs, his successor Arthur Peppercorn and former colleague and CME of the Southern Railway Oliver Bulleid, the four together attending the opening of the Rugby Locomotive Testing Station in 1948. He continued to have an interest in the railway scene, taking an interest in British Railways' standardisation scheme developing under Robert Riddles, which mirrored his own ideas and changes implemented during the war. Members of his team, such as Edward Windle, would join the engineering team at BR.
He passed away during the night of 14 July 1954 in North Wales, having suffered from severe chest pains. His funeral was held by the Church of England with no friends or relatives present in accordance to his wishes. Most of his estate was passed to his surviving sister and some to his friends.
Thompson's designs.
Thompson rebuilt a select number of Gresley locomotives that were problematic and had low availability, in addition to attempting to design his own locomotives based on Gresley designs. While Thompson was critical of some of Gresley's design practices, he continued with some design features such as the use of a double Kylchap exhaust and large smokeboxes and his predecessor's influence was still visible in his design. Thompson's Pacific locomotives all retained three cylinders, but with divided drive and 3 independent sets of Walschaerts valve gear rather than Gresley's own valve gear design. The outside cylinders were placed behind the front bogie with the inside cylinder well forward, giving his Pacific locomotives an elongated look which was not commonly seen on the LNER. 
Claims of Thompson's locomotive underperforming suggests that his designs failed in multiple aspects, with accusations including excessive wheel slip, frame fractures, going against LNER practice and requiring more maintenance. However, Simon A.C. Martin has found no evidence suggesting that they were considered as failures and in cases, contrary to popular claims, found that they were capable and reliable locomotives. While Thompson's Pacifics may have slipped more than other Pacific types on the LNER network due to a poorer weight distribution with a longer frontend, all Pacific locomotives are prone to wheelslip, with Bulleid's Pacifics being just as, if not more infamous for their wheel slip. Thompson also instituted a different maintenance regime for his locomotives where they would be shopped more often for smaller repairs and prevent issues from cascading into major accidents.
Despite some faults, Thompson's Pacifics were well designed and retained the ability for high speed running, being able to hold speed in excess of 90 mph, with design features such as the steam circuit carrying over into Arthur Peppercorn's designs. Peppercorn's A2 design was a further development of Thompson's A2/3 design, which itself was a development of the A2/2 rebuilt from Gresley P2s. Under Arthur Peppercorn, some of Thompson's locomotives were fitted with boilers to Peppercorn's design, reviving the "banjo dome" featured on Gresley locomotives.
Thompson's most successful design was the two-cylinder mixed traffic Class B1 4-6-0. The LNER did not have a general purpose mixed traffic engine, such as the highly successful GWR Hall Class or the LMS Stanier 5MT Black Fives. The B1 was based loosely on Gresley's class B17 but omitted the third inside cylinder. The cylinders used were from Gresley's H3/K2 Class and the boiler was a standard 5 ft 6 in diameter No. 2 boiler. The layout was simplified for easier maintenance and more effective wartime running. 
The first batch of the Class B1 was authorised in mid-1942, totalling ten with the first being a prototype for further testing. No. 8301 would be frequented by Thompson while under construction, who would ride on the footplate on its first day of operations. It would be named "Springbok" out of respect for the visiting Jan Smuts and South African soldiers. Testing of the B1 would continue well into 1944, comparing it to other locomotives to be replaced. The design proved to be free-steaming, economical and simple to maintain. Construction of the Class B1 was slow beyond the first member, and it took until June 1944 for the other nine members to be completed. More than 400 B1s were built between 1946 and 1952, with British Railways continuing B1 production after nationalisation. Up to 409 B1s were available at any time as one was written off and not replaced after an accident.
The Thompson B1 equalled the LMS Black Five locomotives during the inter-regional exchange trials in the first year of British Railways. Robert Riddles, who would come to design the range of British Railways Standard Classes, praised the B1 for its capability.
Thompson's Class L1 were developed due to a demand from the running department for a modern version of the Metropolitan Railway K class which were reaching the end of their lives. While Gresley V1 and V3 locomotives were available, they were deemed insufficient. It was ordered in large numbers to serve across the LNER's system as a part of the standardisation scheme. It used an uprated boiler based on the V3 with larger fireboxes and water tanks and B1 cylinders and 5 ft 2 in wheels. Testing under George Musgrave showed they steamed well, had a good reserve of power and accelerated quickly. 
Initially thirty were ordered and all emerged by 1948. An additional seventy were ordered from North British Locomotive Company and Robert Stephenson &amp; Hawthorn and delivered to British Railways. Only when in widespread service did problems with overheating axleboxes appear. Experiments to solve these problems were unsuccessful and the L1s finished their working lives without much modifications or reaching their true potential.
The Robinson Class Q4 0-8-0 tender engines were one of the first to be rebuilt by Thompson. Having reached the end of their service life by the late 1930s, most of the class were due to be scrapped. However, with wartime restricting new build locomotives and in need of more powerful shunting engines, Thompson opted to rebuild the design into a tank engine. Most of the old engine, such as the cylinders, motion and boiler, were reused, producing the Thompson Q1, although modifications were made to accommodate an enclosed cab, and the initial 1,500 gallon side tanks were later upgraded to hold 2,000 gallons of water.
In 1942, Thompson rebuilt the Robinson Class J11 and Gresley D49/2 No.365 "The Morpeth". The J11/3 was not visually distinct from its original condition, but was modified with new cylinders, valve gears and valve motion, requiring modifications to the engine frames, boiler and chimney. The rebuilding had the desired effect and another thirty were converted, but most of the class remained in their as built condition. The Gresley D49/2 were fitted with Lentz rotary valve gear, but trials