In 1871, the town was described as a poor place, with narrow streets, fairly good flat-roofed houses, grass huts, decayed forts, and a rusty cannon, enclosed by a recently erected wall  high and protected by bastions at intervals. The growing importance of the Transvaal led, however, to greater interest being taken back in Portugal in the development of a port. A commission was sent by the Portuguese government in 1876 to drain the marshy land near the settlement, to plant the blue gum tree, and to build a hospital and a church. A city since 1887, it superseded the Island of Mozambique as the capital of Mozambique in 1898. In 1895, the opening of the NZASM railroad to Pretoria, South Africa, caused the city's population to grow. The Witwatersrand Gold Rush, which began in 1886, also increased the economic development of the city in the late 19th and early 20th centuries as Lourenço Marques served as the closest seaport for the export of gold from South Africa.