Willesden Junction is an interchange station located in Harlesden, north-west London. It is situated on the Bakerloo line of the London Underground and the Lioness and Mildmay lines of the London Overground. The station is located close to the Old Oak Lane conservation area in the East Acton ward.

The station developed on three contiguous sites: the West Coast Main Line (WCML) station was opened by the London & North Western Railway on 1 September 1866 to replace the London and Birmingham Railway's Willesden station of 1841 which was 0.5 miles (0.8 km) to the northwest. Passenger services ended in 1962 when the platforms were removed during the electrification of the WCML to allow the curvature of the tracks to be eased. Later the bridges for the North London line (NLL) were rebuilt.

The High-Level station on the NLL was opened by the North London Railway in 1869 for two Richmond tracks and later for two Shepherds Bush tracks, both crossing the WCML roughly at right angles. In 1894 a new, combined High-Level station was built, with an island platform plus a third shorter platform for Earls Court trains (which was later removed) together with a new station entrance building which still survives. By 1897 199 passenger trains and 47 goods trains passed through the High-Level station each day. The 'Willesden New Station' or Low-Level station on the Watford DC line was opened in 1910 to the north of the main line with two outer through platforms and two inner bay platforms at the London end. The bay platforms were originally long enough for four-coach Bakerloo trains when such trains ran outside peak times, but were shortened in the 1960s when a new toilet block was installed; in more recent times the platform buildings have been reconstructed and the bay length increased due to the addition of a fourth and then a fifth coach to class 378 trains.

In 1896 staff totalled 271, including 79 porters, 58 signalmen (in 14 signal boxes) and 58 shunters and yard foremen. They issued 1,006,886 tickets to passengers in 1896, up from 530,300 in 1886. Many of them were housed in what is now the Old Oak Lane conservation area, built by the LNWR in 1889 and which included an Institute, reading room and church.

The main-line platforms were numbered from the south side (including one or two on the Kensington route) followed by the high level platforms and then the DC line platforms which thus had the highest numbers. Later the surviving platforms were renumbered.

A freight liner terminal was opened in August 1967. It was built on an 18-acre site of the steam locomotive depot alongside the main electrified rail-link. It was opened by John Morris, Parliamentary Secretary for the Ministry of Transport. The terminal had the capacity to handle 2,000 containers a week.

In the late nineteenth century, it was nicknamed "Bewildering Junction" or "The Wilderness" because it contained such a maze of entrances, passages and platforms.

On 5 December 1910, a passenger train was in a rear-end collision with another at the station. Five people were killed and more than 40 were injured. The accident was due to a signaling error. In June 1936, one first-class passenger was killed and four other passengers were injured on the main line track just north of the station. An LMS passenger train heading to Watford was struck by a piece of equipment sticking out of the milk train heading to Euston. On 6 October 1986 at 17:00 a class 313 train collided with the rear of a stationary Bakerloo line train on the up line to the east of the station between the Scrubbs Lane overbridge and Kensal Green tunnel (the location was officially described as "Kensal Green"). 23 of 25 passengers were injured, all but one were discharged from hospital during the same evening.

There are no platforms on the West Coast Main Line, which is separated from the low-level station by the approach road to Willesden Depot which lies immediately south-east of the station.

The high-level (HL) station consists of an island platform rebuilt in 1956, with faces as platforms 4 and 5, which are roughly at the level of Old Oak Lane to the west of the station, serving the NLL and the West London line (WLL); some trains on the latter reverse in a central turnback siding on the NLL to the east of the station, this opened in 2011. Both platforms have been extended across the DC line to accommodate 4-coach class 378 trains. The HL station previously had a third platform on the eastern side which was used by services to/from Earls Court. There is another turnback siding further east which was previously used; it was laid in the late 1990s to allow Royal Mail trains to reach the Royal Mail depot at Stonebridge Park.

The low-level station, at the level of the area to the south, is an Edwardian island platform, with outer faces as platforms 1 and 3 and northern bay platform bay as platform 2, the southern bay now has no track. In October 2014 the DC line was closed temporarily between Wembley Central and Queens Park reportedly by Network Rail (London Overground) to allow platform 2 to be extended further west as a through platform. Most of the original and later platform buildings were demolished when platform 2 was extended in preparation for longer Class 378 trains and provision of a new footbridge and lift in 1999.

Platforms 1 and 3 are used by the Bakerloo line services, which began on 10 May 1915, and London Overground services between Euston and Watford Junction. Until May 2008 north-bound Bakerloo line trains which were to reverse at Stonebridge Park depot (two stations further north) ran empty from Willesden Junction although the southbound service began at Stonebridge Park. This imbalance arose as there were no London Underground staff beyond Willesden Junction to oversee passenger detrainment, but this changed after London Underground took over the staffing of stations on the line, including Stonebridge Park, from Silverlink in November 2007, and trains bound for Stonebridge Park depot now terminate at Stonebridge Park station. Normally only the first and last NLL trains of the day, which start or terminate here, use the bay platform, though it is used for empty stock transfers between the depot and the North London and Gospel Oak to Barking lines.

The station signs on the platforms say, below the Overground roundel, "Alight for Harlesden town centre".

The LNWR opened a large locomotive depot on a site on the south side of the main line to the west of the station, in 1873. This was enlarged in 1898. The London Midland and Scottish Railway opened an additional roundhouse on the site in 1929. Both buildings were demolished when the depot was closed in 1965 by British Railways and replaced by a Freightliner depot. (The servicing of locomotives and multiple units was then undertaken by the present Willesden TMD on the other side of the line.)

The steam depot had the shed code 1A and was a major depot for predominantly freight locomotives used on the West Coast Main Line and for suburban passenger services from Euston.

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Legend
Station National Rail Liberty line Accessible station Thameslink Lioness line Interchange station Elizabeth line Mildmay line Accessible interchange Docklands Light Railway Suffragette line Internal interchange London Underground Weaver line Out-of-station interchange London Trams Windrush line (   ) Nearby interchange London River Services The new London Overground line names and colours were introduced across the London rail network in November 2024

London Overground operate Mildmay line services from the high-level station on the North London line using Class 378 EMUs. The weekday off-peak service is:

• 8 tph to Stratford
• 4 tph to Richmond
• 4 tph to Clapham Junction

London Overground also operate Lioness line services from the low-level station on the Watford DC line using Class 710 and Class 378 EMUs. The weekday off-peak service is:

• 4 tph to London Euston
• 4 tph to Watford Junction

London Underground also operates Bakerloo line trains on the Watford DC line using 1972 Stock. The weekday off-peak service is:

• 8 tph to Elephant & Castle
• 4 tph to Stonebridge Park
• 4 tph to Harrow & Wealdstone

Historical Railways

Preceding station	London Underground			Following station
Harlesden towards Harrow & Wealdstone		Bakerloo line		Kensal Green towards Elephant & Castle
Preceding station	London Overground			Following station
Acton Central towards Richmond		Mildmay line North London line		Kensal Rise towards Stratford
Shepherd's Bush towards Clapham Junction		Mildmay line West London line
Harlesden towards Watford Junction		Lioness line Watford DC line		Kensal Green towards Euston
Historical railways
Wembley Central		London and North Western Railway West Coast Main Line		Queens Park (London)
Brentford		Anglia Railways London Crosslink		West Hampstead

The station area is served by London Buses routes 18, 220, 228, 266, 487 and night route N18.

• Train times and station information for Willesden Junction station from National Rail
• London Transport Museum Photographic Archive
  • Bakerloo line train at Willesden Junction station, 1917
  • Willesden Junction station entrance, 1928
• Willesden Junction, SubBrit stations project
• Winchester, Clarence, ed. (18 October 1935), "Willesden Junction", Railway Wonders of the World, pp. 1192–1194, description of the station in the 1930s