Bo did not so much grow as get summoned. When the Sierra Leone Government Railway pushed inland and reached the spot in 1903, it pulled a town up around the tracks. The line turned a cluster of villages into a junction - a place where goods, people, and ambitions converged. For decades, Bo was the railway's child, the inland capital of a colonial protectorate that ran on steam and timetables. The trains stopped running in 1974, and the line is gone now, but the city the railway made stayed. Today Bo is home to roughly 223,000 people, the financial and commercial heart of the country's south, and the administrative center of Bo District.

In 1906, the colonial government opened a school in Bo with a deliberate purpose: to educate the sons of Paramount Chiefs, and nominees of chiefs, into the men who would help run the protectorate. Bo Government Secondary School - the Bo School - became one of the most influential institutions in the country, a forge for Sierra Leone's political and professional elite. Generations of leaders passed through its dormitories, named for distant cities: Manchester, London, Liverpool, and Paris. The school eventually opened its doors to boys of every background, but its founding logic lingers in the city's character. Bo thinks of itself as a place that makes leaders, and from 1930 until independence in 1961, it was the protectorate's capital - the seat of inland power.

When civil war tore through Sierra Leone for eleven years, much of the country fell to rebel advances. Bo did not. The city organized a civilian militia and held the line, keeping the fighters out and earning a reputation that residents still wear with pride. "Resolve, resistance, hospitality" is how the city describes its own people, and the war made those words mean something specific. Bo became a refuge - Matilda Lansana Minah, the Paramount Chief of Pujehun District, was among those who sheltered here while the conflict raged. The city that the railway built turned out to be a city that could defend itself.

Bo is an evenly divided city in the gentlest sense - its population is split almost equally between Muslims and Christians, and mosques and churches share the same streets without much fuss. The Mende are the largest group, but the city draws people from across Sierra Leone and a sizable Liberian community besides. Football is the shared religion: Bo Rangers and Nepean Stars both play in the national premier league at Bo Stadium, and match days fill the air with noise. That air shifts with the seasons. From May to November the monsoon drenches the city - some parts of the region see more than 5,000 millimeters of rain a year. Then the wind reverses, and the dry, dust-laden Harmattan blows down from the Sahara, hazing the light and cooling the nights.

In 1981, Bo District reached across continents and tied itself to Warwick District in England through a partnership called One World Link, built on ideas of justice, mutual support, and shared development. Over four decades it produced women's groups, school exchanges, youth programs serving more than a thousand young people, and in 2008 a community center in the city itself. It is a quietly remarkable thing - a town in southern Sierra Leone and a district in the English Midlands choosing to learn from one another for forty years. Bo has always been a junction. The railway brought the first travelers; the link with Warwick suggests the impulse to connect outlived the trains.