Harrow, United Kingdom

By 1865, a series of roads had been built in Greenhill, including College, Roxborough, Kymberley, Headstone, Clarendon, Byron and St Anns - but few houses. A parish church, St John's Church, was built in 1866 on a farm and Greenhill subsequently became a separate ecclesiastical parish in 1896. The church building has been Grade II listed since 1994. The Metropolitan Railway connection dates from 1880 with the building of Harrow-on-the-Hill station, which led to a housebuilding boom and a population of 4,892 by 1902. Developments westward along the railway in the Headstone and Pinner as well as Roxborough and Wealdstone engulfed Greenhill with new developments, and soon enough there was nothing left of the original village.

In 1899, the junction of Grove Hill and Lowlands Road is said to have been the scene of Britain's first fatal car accident. There is a plaque to commemorate this at the top of Grove Hill where it meets the High Street and Peterborough Hill.

In Greenhill, there was a workmen's club from the 1860s and a public hall, Victoria Hall, by 1888.

The Local Government Act 1894 converted local board districts such as Harrow on the Hill into urban districts. The new town centre, which had grown up around the station, became known simply as Harrow to distinguish it from the original hilltop village. The name of the urban district, which contained both places, remained Harrow on the Hill until 1934 when the district was enlarged and renamed just Harrow. The Harrow Urban District was incorporated to become a municipal borough in 1954, with the same area becoming the London Borough of Harrow on being transferred from Middlesex to Greater London in 1965.

Harrow contributed to the growing photographic industry in the UK; a large industrial premises was built in 1890 by the American Eastman Kodak company in Wealdstone, and by 1965 there were over 100 buildings on a 55-acre site at Kodak Harrow, employing 5,500 people, including a research centre. This facility operated for 125 years. The long chimney has been a landmark in Harrow ever since.

In 1914, a major department store named Sopers opened on Station Road. The site became a Debenhams store; it closed in May 2021 after the collapse of the Debenham's chain. Its facade dated from the 1960s.

During the inter-war period Harrow had grown into a suburb. Almost two-thirds of housing stock in the present day Borough of Harrow dates back to the interwar period.

The modern town of Harrow and much of the borough overall has been defined historically by the growth of the railways, as Harrow expanded and saw housing developments as a result of the building of the Metropolitan Railway into what was, in early Victorian times, the rural areas to the north-west of London. The borough now has many railway stations.

Harrow has been the location of several serious train accidents.

On 7 August 1838, Thomas Port died from injuries received in a train accident near Harrow. His gravestone in the parish churchyard of St Mary's, Harrow-on-the-Hill, states: "To the memory of Thomas Port, son of John Port of Burton-upon-Trent in the County of Stafford, Hat Manufacturer, who near this town had both legs severed from his body by the railway train. With great fortitude, he bore a second amputation by the surgeons and died from loss of blood, August 7th 1838, aged 33 years."

On 26 November 1870, two trains collided at Harrow & Wealdstone station, killing 9 and injuring 44.

On 8 October 1952, three trains collided at Harrow & Wealdstone station, killing 112 people. Of the dead, 64 were railway employees on their way to work. This is the greatest loss of life in any United Kingdom railway accident in peacetime.

Although The Blitz is generally claimed to have started on 7 September 1940, many sources state that one of the earliest bombing raid from the Luftwaffe occurred in Harrow and Wealdstone on 22 August 1940. It caused damage to cinemas, houses and a bank, but with no fatalities. Although Harrow was then in Middlesex, it was classed as a London area by the civil defence as it came under the jurisdiction of the Metropolitan Police. The very first air raid on the present day London area is believed to be the accidental bombing of Croydon Airport on 15 August 1940, which was then in Surrey.

The town was part of the Harrow Urban District, a district council within the county of Middlesex, from 1934 until 1965, which also included parts of Edgware, Hendon, Wembley and Pinner. The London Borough of Harrow was formed in 1965 as the only London borough unaffected by boundary changes.

By the 1950s, Harrow was described as the "capital city of Metro-land". The borough's council Civic Centre building complex was built in 1970–1972, opened 6 May 1973, on Station Road in Wealdstone. Six storeys high and designed by architect Eric Broughton, the building is considered "outdated and costly" in 2018 and was expected to be imminently redeveloped. Throughout the 1960s and 1970s, many new office blocks were built in the town, especially in Lyon Road and the western end of College Road.