Old Oak Common TMD

GWR

GWR 4700 Class 2-8-0 express freight loco 4706 being serviced at Old Oak Common on 15 December 1963

Steam locomotives near the coaling plant, September 1956

Following the reconstruction of Paddington station and the introduction of larger locomotives and new routes, the Great Western Railway (GWR) required a larger depot than that at the 1855 constructed Westbourne Park, at which to service its locomotives and carriages.^[3]

In 1901, a site was acquired in South Acton, south of the Grand Union Canal and on the upside of the mainline. Taking four years to layout and build, designed by G.J. Churchward, it was the largest depot on the entire GWR system, and set the pattern for similar depots throughout the GWR including Tyseley.^[3][4]

It had four 65 feet (19.8 m) undergirder turntables, under six-spans of east-west aligned northern-light pitched roofs. The shed covered a total area of 360 feet (110 m) (six bays of 60 by 444 feet or 18.3 by 135.3 metres} (six bays of 74 feet or 22.6 metres).^[3] The roofs were made of wood and steel rafters covered in Welsh slate tiles, supported on steel or cast iron columns, with solid London Brick Company walls. Laid out in an interconnecting 4-square pattern under the roof, each electrically operated turntable was fully boarded, and had 28 tracks spanning from it, able to accommodate locomotives up to 75 feet (22.9 m) in length.^[3]

The associated repair shop, termed "The Factory", was allocated to the northeast front of the depot, with 11 roads approached over an electric traverser, and a 12th road direct from the depot throat. Built in a similar style to the depot, it was 195 feet (59 m) by 110 feet (34 m) in size, and housed a 30-long-ton (30.5 t; 33.6-short-ton) crane. There were also separate Smithy and carpenters shops, a stores and a general office.^[3]

The approach to the shed housed a standard GWR pattern coal stage, again the largest on the system. It was approached via a 1:50 gradient brick-arch supported ramp, with 1:80 beyond the stage. In 1938, the approach roads to and from the coal stage were doubled, and in 1942 an ash shelter constructed to protect from Nazi Luftwaffe bombing. The four water tanks housed over the stage held 290,000 imperial gallons (1,300,000 l; 350,000 US gal) of water, while sand was supplied from a separate sand furnace.^[3]

The whole depot came into operation from 17 March 1906, and became the head of the GWR London operating division.^[3][5]

British Railways

The first-of-class (Class 52) D1000 Western Enterprise, inside the roundhouse in 1964

The former western turntable in 1980s looking east, with "The Factory" buildings to the rear

Throughout its GWR and early BR operational life, the depot remained fairly intact and similar to its original layout. The only major difference by the early 1960s was the addition of a pre-war diesel refuelling stage just north of the repair shop, for use by GWR railcars.^[3]

With a reduction in steam traction and the implementation of the Beeching cuts, in March 1964 the decision was taken to move the remaining steam locomotive allocation to the 1950s designed Southall MPD, and reconstruct Old Oak Common as a diesel depot.^[3] Within a year the majority of the GWR 1906 depot was demolished, with only "The Factory" repair shop, furthest western turntable and parts of the stores remaining.^[3] The main service building had 3 tracks, each holding two locos, with inspection pits, fuel supply points and a washing plant on the approach road. Some of the inspection pits in The Factory were also lengthened and deepened and jacks provided to allow for bogie and spring changing. It opened on 20 October 1965.^[6] It was the last of six big diesel depots built for the Western Region,^[7] the others being Margam TMD 1960, Bristol Bath Road depot 1960, Laira Traction Maintenance Depot, Plymouth, 1962, Landore TMD, Swansea, 1963 and Cardiff Canton TMD 1964.

Just south of the residual GWR buildings, in the 1960s BR built what was initially the storage depot for the Blue Pullman trains, what later became known as the Coronation Carriage Sidings. In the late 1970s, south of this and almost adjacent to the Great Western Main Line (GWML), BR built a depot for the new InterCity 125 fleet. Today trains which operate the Great Western Railway services are maintained here. This will cease in December 2018.

In 1997 a new bespoke depot was constructed at the southern end of the site, between the Great Western depot and the main line, funded by the British Airports Authority to service and maintain the Heathrow Express and Heathrow Connect service trains. This was the first new privately funded train depot in the UK since the British railways nationalisation in 1948. The inauguration of the Heathrow Express services saw the electrification of the GWML from Paddington to Hayes and onto Heathrow Airport using 25kV overhead catenary.

On 26 July 2002, First Great Western opened a new depot on the site of the former carriage sidings to service its Class 180 fleet.^[8][9]

The residual GWR buildings were used from the 1970s to house and maintain singular diesel locomotives, special trains, and maintain carriages and freight stock in the area. On the privatisation of BR, the buildings were allocated to English Welsh & Scottish, and latterly operated by its commercial subsidiary Axiom Rail. The site was vacated in May 2009.^[10] In 2009, this site, together with the adjacent Coronation Carriage Sidings was fenced off due to compulsory purchase for the Crossrail project. All the remaining GWR buildings and the Coronation Carriage Sidings were demolished by mid-2011, with the former western shed turntable donated to the Swanage Railway.

In December 2017, maintenance of the Night Riviera was transferred to Penzance Long Rock Depot with the stock laying over at Reading TMD at its northern end.^[11][12]

Notes

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