Thies

Thies helps generate 10.6% of Senegal's GDP, which is why calling it the country's rail capital undersells the job. The city's three communes are projected to hold about 401,521 people in 2025, roughly 70 kilometres east of Dakar at about 72 metres above sea level. Official summaries point to workshops, schools, and handicrafts. The more useful lens is that Thies acts as Senegal's switching yard, where commuter traffic, mining logistics, technical training, and commerce keep thickening the same corridor.

National data explain why that role keeps expanding. ANSD says the wider Thies region produced 1,981.7 billion FCFA ($3.3 billion) in 2023, or 10.6% of Senegal's GDP, second only to Dakar. Commerce accounted for 19.3% of regional value added, while agriculture and related activity contributed 14.8%. Thies is not a railway museum with a city around it. It is the switching yard that keeps Senegal's west-to-interior corridor organized.

Rail keeps reproducing that advantage. Passenger service between Thies and Diamniadio resumed in 2024 with two reversible trains offering 500 seats and a direct link into the Dakar TER. In 2025, the ISEP in Thies received Senegal's first freight-train driving simulator, a 1 billion FCFA ($1.7 million) project backed by Industries Chimiques du Senegal, ACIA, and LANDER. That is path dependence in plain view. Network effects reinforce it, because every extra service, school, repair capability, and commuter link makes Thies more useful to the next operator. Mutualism keeps the system sticky: industry needs trained workers, schools need industrial partners, and traders need both.

Biologically, Thies resembles a slime mold. Slime molds test many routes, then reinforce the paths that move nutrients most efficiently. Thies does the urban version. Flows between Dakar, the phosphate belt, and inland markets keep thickening the same corridor until the city becomes part depot, part classroom, and part switching logic for the wider economy.