British Rail

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Distribution of locomotives, March 1974^[8]

ED HA IM TI TO
Code	Name	Quantity
ED	Eastfield	49
HA	Haymarket	19
IM	Immingham	7
TI	Tinsley	44
TO	Toton	109
Total:		228

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The first batch of Class 20s were allocated to Devons Road depot in Bow, London to work cross-London transfer freights, with the following eight locos allocated to Hornsey depot. After a trial with D8006, D8028–D8034 were allocated for work in highland Scotland, and had tablet catcher recesses built into the cabsides. D8035–D8044 were originally to be allocated to Norwich, but were actually used for empty coaching stock (ECS) workings in and out of London Euston. D8050–D8069 were allocated to the new Tinsley TMD in South Yorkshire, from where they regularly worked into Lincolnshire and East Yorkshire. D8070–D8127 were sent to operate in the Scottish Lowlands, particularly in the Forth-Clyde area, and the Fife coalfield. This completed the original orders for 128 locos, the last being delivered in August 1962.

With the subsequent order for a further 100 Class 20 locos, deliveries recommenced with D8128 in January 1966. Tests in 1967 using D8179 and D8317 resulted in locos from D8316 being delivered from the manufacturer with the new electronic control system for working merry-go-round (MGR) coal trains. Trains to Longannet Power Station sometimes required locos to triple-head trains.^[4]

After privatisation

Some Class 20s were used on the construction of the Channel Tunnel and High Speed 1 and some even made their way to France to work for the Compagnie des chemins de Fer Départementaux (CFD) in industry there, although these have since been repatriated. Some locos have in the past been hired by Hunslet-Barclay to provide motive power for weedkilling trains.

The fleet of Class 20/3s owned by Direct Rail Services (DRS) has at times seen frequent work across Britain in pairs (or with Class 37s) on nuclear flask trains, the company's speciality. DRS supplies class 20s for use with the Rail Head Treatment Train in winter. Perhaps the most unusual train hauled by a Class 20 was the Kosovo Train for Life charter train in autumn 1999 which carried 800 tonnes of aid. Leaving London's Kensington Olympia station on 17 September 1999,^[9] the train was hauled by 20 901, 20 902 and 20 903 throughout, reaching Prague by 20 September^[10] and arriving at Pristina station at 10:00 on 25 September.^[11]

DRS initially had a fleet of 15 operational Class 20/3 locomotives. Three of these have subsequently been disposed of for scrap, after stripping for spares; a further two have been sold on to Harry Needle Railroad Company (HNRC). Following the end of the 2019 Sandite season (Rail Head Treatment Trains), all of the remaining DRS Class 20/3 fleet were stood down, awaiting disposal.

In 2005 HNRC acquired a large number of 20/0s and 20/9s from the stored DRS fleet. By May 2008 HNRC had eight operational Class 20s and sixteen in storage; two were on hire at Corus Scunthorpe (nos. 81 and 82).

Over a ten-year period, concluding in 2019, a number of class 20s from HNRC were employed to deliver new S-Stock from Bombardier Transportation at Derby Litchurch Lane Works, to London Underground at Neasden depot or West Ruislip depot, for commissioning. Subsequently, immediately after the completion of deliveries, modification of these units (addition of equipment for automatic signalling) was required and they were returned to Derby in the same manner. Formation of the trains usually consisted of a pair of Class 20s, two barrier wagons, the LU S-Stock set, two barrier wagons and a dead-in-tow pair of Class 20s at the rear.

British Rail

D8000 was delivered in June 1957 in overall green livery, with grey footplate,^[6] red bufferbeams and a grey roof extending down the bodyside to the edge of the roof panels.^{[12][page needed]} The original batch of 10 locos bore the BR crest facing towards the nose on both sides, used yellow sans serif numerals, and had green cab roofs; locos from D8010 had the correct pattern BR crest, white numerals and grey cab roof.^[6] This was adjusted after D8103^[6] to include a small yellow warning panel, although the precise size and detail of such panels varied somewhat.^[4]

In 1966, D8048 was selected by the BR design panel for livery experiments and was painted in the prototype standard blue, including the bufferbeams and roof. The exceptions were the full yellow front ends and a black underframe.^[13] After the adoption of Rail Blue as the BR livery, D8178 became one of the first locomotives to be delivered in this livery (along with Class 25 D7660 and Class 47 D1953)^[13] and all subsequent locomotives were delivered in this livery. Despite this, some locos continued to be returned to traffic in green livery, although often with the later BR "double arrow" logo and data panel;^[6] thus 20 141 was the final main line loco to carry BR green livery.^[14]

Some locomotives, including 20 227, were repainted in the Railfreight grey livery with red sole bars, yellow ends and large double arrows on the sides.

At least four of the class were painted in the British Rail Telecommunications livery:^[15]

• 20 075 – Sir William Cooke – rebuilt as 20 309 and currently stood down by DRS, awaiting disposal
• 20 128 – Guglielmo Marconi – rebuilt as 20 307 and has been scrapped
• 20 131 – Almon B. Strowger – rebuilt as 20 306 and has been scrapped
• 20 187 – Sir Charles Wheatstone – rebuilt as 20 308 and currently stood down by DRS, awaiting disposal

Privatisation

Class 20/3 locomotives operated by DRS have all been painted in DRS Oxford Blue livery, with red bufferbeams and full yellow ends. There have been small variations in the shade of yellow used on these locos, and the penetration of blue from the sides onto the ends.

Class 20 locomotives operated by the Harry Needle Railroad Company (HNRC) are painted into house colours of orange and black, with yellow nose ends (20 121, 20 166, 20 311 and 20 314). Some other locomotives owned by HNRC, of subclasses 20/0 and 20/9, have been painted in a variation of two-tone Railfreight grey livery. These have dark grey roof, mid-grey upper body and light grey lower body, black underframe and buffer beam. The nose ends are painted yellow, with the lower part of the cab end in yellow and the upper part black, this continuing around the cab sides but with the light grey instead of yellow. Others are in BR Blue or Railfreight Red-stripe livery. HNRC Class 20s on long-term hire to Corus were painted in Corus livery; previously silver but currently a bright yellow with red solebar (No.81 – 20 056). Since the Corus business was bought by the Indian Tata Steel group, some of these locomotives have been repainted into Tata Blue livery (No.82 – 20 066). Two HNRC Class 20s have been painted into GBRf Europorte's blue and gold livery (20 901 and 20 905), while two other HNRC Class 20s have been painted in the White livery of Hope Construction Materials (now Breedon Cement), with a black solebar (No.2 – 20 168) and a white solebar (No.3 – 20 906).

Four locomotives carried the orange and white livery of the CFD (Compagnie de Chemins de Fer Départementaux) whilst working in France, these were 20 035, 20 063, 20 139 and 20 228.

Two locomotives, numbers 20 142 and 20 189, were briefly (for a matter of months during 2013) painted into a Balfour Beatty blue and white livery but were then returned to a variation of BR blue.

The last built class 20, number 20 227, has been used extensively on the London Underground network. In the mid-2000s it was painted in Metropolitan maroon livery and named "Sir John Betjeman" by the Class 20 Locomotive Society as acknowledgement of this work. It was repainted in a special 'modern taste' LUL-based livery, to mark the London Underground 150 celebrations but has now been repainted, again into Metropolitan maroon, but this time lined, and renamed "Sherlock Holmes". The "Sir John Betjeman" name is now carried by 20 142, which also sports Metropolitan line maroon livery.

Mainline registered class 20s are:^{[16][page needed]}