The Central Uruguay Railway (CUR) was one of the five original rail systems in Uruguay. The other four were the Midland Uruguay Railway Co., the North Western of Uruguay, the Uruguay Northern, and the Uruguay East Coast Railway. CUR, including its leased and worked lines, was considered the most important system. It controlled about 970 miles (1,560 km) of track. The system operated four sections: the Central Uruguay Railway Original Line (including the Northeastern Line), 271 miles (436 km); the Northern Extension Railway, 185 miles (298 km); the Eastern Extension Railway, 311 miles (501 km); and the Western Extension Railway, 211 miles (340 km).
Central Uruguay Railway Co. of Montevideo, Ltd. was registered In London in 1876. It was the largest railway company in Uruguay. It operated from 1 January 1878 to January 31, 1949, when railroads were nationalized. It worked, leased and absorbed some smaller rail systems. By the end of the era of British railways in Uruguay, CUR had a network of 1,665 kilometres (1,035 mi) standard gauge, about half of the total within the country. It owned about 170 steam locomotives and several thousand cars. In 1891, CUR's British and Uruguayan employees founded the Central Uruguay Railway Cricket Club.
The Central Co. included the Central Uruguay and the Northeastern lines. It operated the lines of the Western Extension, the Northern Extension, and the Eastern Extension companies. The Central ran from Montevideo to Santa Isabel, across the Rio Negro, with a branch from Santa Lucia to San José de Mayo; the Northeastern connected Montevideo and Minas. The Western Extension ran from San Jose to Mercedes, with a branch to the port of Colonia. The Northern Extension continued the Central from Santa Izabel to Rivera on the Brazilian border. The Eastern Extension started from a point on the Northeastern 20 miles from Montevideo and ran to Melo, with a branch to Treinta y Tres.