The London Midland, London Overground, and Bakerloo Line station was opened on July 20 1837.
TfL wished the station a happy 180th birthday to celebrate the milestone.
The station was opened by the London and Birmingham Railway (L&BR) as simply ' Harrow ', in what was then rural Middlesex.
At the time the station was built, Wealdstone was fields and the nearest large settlement was Harrow-on-the-Hill, 1.5 miles south.
It was renamed Harrow and Wealdstone in 1897, and the Bakerloo Line was introduced to the station in 1917.
Inspired by the milestone, Getwestlondon looked back through the archives to find out what other west London stations looked like in years gone by, courtesy of London Transport Museum .
Did you know that Fulham Broadway used to be called Walham Green? It was built in 1879, opened in 1880, and was re-named in 1952.
Back in the day, large District Railway signs are displayed at roof level, advertising the frequency of service.
One of London's best known stations, Paddington , dates back to 1854, when Isambard Kingdom Brunel built the main train shed.
It was first served by London Underground trains in 1863, as the original western terminus of the Metropolitan Railway, the world's first underground railway.
Today, Paddington tube station is served by the Bakerloo, Circle, District, and Hammersmith & City lines.
Did you know, the only stained glass window on the London Underground can be seen at Uxbridge station?
Uxbridge station used to be situated on Belmont Road, opened in 1904. But as it was not well-suited to serve the town centre, a new station on the High Street was opened in in 1938.
The old station in Belmont Road now homes the Sainsbury's supermarket.
Chiswick Park station... isn't actually in Chiswick . And it started life as 'Acton Green' in 1879.
It was re-named to Chiswick Park in 1887 and the station was completely rebuilt between 1931 and 1933.
Each platform has a part-glazed enclosed waiting area with an original timber bench. The only other station to have this particular feature is Stamford Brook.
Ealing Broadway began life in 1879, named after the main road beside the station.
It was served by the District Line from the beginning, with the Central Line joining on in 1920.
The 1911 District Railway station designed by Harry Ford remains in existence, although it is no longer used for railway purposes.
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