Before the trains: a parish of hamlets

In the middle of the nineteenth century, Harrow was not a town at all. It was a scatter of settlements separated by fields and hedgerows: the old village on the hill, with its church spire and famous school; Greenhill at the foot of the slope; Wealdstone, little more than a hamlet beside the main road; and Pinner away to the west, a village with a green, a few shops and a medieval church. Between them lay hay meadows that fed London's horses, market gardens, orchards, and brickearth dug and fired in local kilns.

A railway had already arrived. The main line north ran through Wealdstone from the late 1830s, but it changed village life surprisingly little. Fares were expensive and trains were infrequent, and the station stood a mile from the old village along a muddy lane. Only the wealthy could commute; everyone else walked to work in the fields, the yards or the big houses on the hill.

1880: the cutting beneath the hill

The turning point came when the underground reached Harrow. In 1880 a new line was driven through the valley at the foot of the hill, and the station opened in a deep cutting below the school and the church. That layout still defines the place: spire above, platforms below, a town of two levels joined by steep paths and flights of steps.

The effect was immediate but uneven. Trains ran to the West End in well under half an hour, and speculative builders began putting up houses on the fields nearest the station. By 1885 the line had pushed on to Pinner, and further stations followed as the years passed, including West Harrow and North Harrow in the years before the First World War. Each new halt created its own little catchment area of villas within a short walk of the platform.

Cheap fares, cheap land, and the great build-out

What really transformed Harrow was the marriage of modest season tickets with agricultural land values. For the price of a few shillings a week, a clerk could live in a semi-detached house with a garden and still reach a desk in the City. The railway company itself advertised the idea relentlessly, promising fresh air, trees and a cottage in the country with a fast train to town.

Developers bought fields by the acre and laid out streets at speed. Look at the fabric of the borough and you can read the sequence:

• Victorian and Edwardian terraces close to the old stations, with bay windows and narrow front gardens.
• Long avenues of 1900s villas stretching towards Pinner, Kenton and Belmont.
• Acres of 1930s semi-detached houses with pebbledash, garages and room for a small car.
• Shop parades at the junctions between the new estates and the main roads.

The population multiplied several times over in a single generation. Parishes that had counted their residents in hundreds were absorbed into a sprawling suburb of tens of thousands.

New lines, new centres: 1917 to 1934

The next wave came with electric traction. When electric trains began running through Wealdstone in 1917, the journey became quicker, cleaner and cheaper still, and Wealdstone's character changed too — it grew into a working railway town, with sheds, sidings and generations of families employed on the trains.

In the early 1930s the network reached the north-western edges of the borough, opening stations that still feel modern: Canons Park and Stanmore in 1932, with more stops added nearby soon afterwards. Fast, frequent services to the West End triggered another burst of housebuilding, and the fields around those stations disappeared within a decade. Suburbia was no longer a ribbon along the old roads; it filled the space between them.

What the stations did to daily life

The Underground did more than move people. It reset the rhythm of the day. Households timed everything to the timetable: the 8.12 up, the 6.40 down, the paper bought on the platform, the evening return with the commuters spilling out to be met by children at the gate. Season tickets made regular journeys affordable, and dozens of new churches, chapels, schools and clubs were founded to serve the arrivals.

Shopping moved to the station. Every new halt acquired a parade of a dozen or so units — a grocer, a butcher, a baker, a newsagent, a chemist, a tobacconist, a boot repairer — and these little parades became the everyday high streets of the new suburbs, distinct from the older shopping streets that had grown up along the turnpike roads. Cinemas, dance halls and sports grounds followed the crowds. An evening out in town, and home by midnight, became ordinary.

Reading the traces today

You can still walk the Underground's fingerprints. Stand on the bridge at Harrow-on-the-Hill and watch the two levels of the town work together. Then take a station and walk outwards for a mile, noting how the housing changes with each street, and how the shop parades sit exactly where the estates meet the main roads.

Three practical ways to dig deeper:

• Compare an 1890s Ordnance Survey map with a 1930s one for the same area — the spread of streets is startling.
• Look at the buildings themselves: station frontages, pub names, road names taken from the farms they replaced, and the telltale gap between front doors that marks a 1930s speculator's plan.
• Visit the local studies collection and the county archive; rate books, estate plans and sales particulars list house by house who built what, and when.

The trains did not simply carry passengers across Middlesex. They carried a new way of living: a garden, a mortgage, a season ticket and a place on the morning train. Much of what we now think of as Harrow was designed, quite deliberately, around the timetable.