Starting in the 1850s, entrepreneurs known as lumber barons began to build large sawmills, which became some of the largest mills in the world. Rail lines built in 1854 connected Ottawa to areas south and to the transcontinental rail network via Hull and Lachute, Quebec in 1886. The original Parliament buildings which included the centre, East and West Blocks were constructed between 1859 and 1866 in the Gothic Revival style. At the time, this was the largest North American construction project ever attempted and Public Works Canada and its architects were not initially well prepared. The Library of Parliament and Parliament Hill landscaping were completed in 1876. By 1885 Ottawa was the only city in Canada whose downtown street lights were powered entirely by electricity. In 1889, the Government developed and distributed 60 "water leases" (still in use) to mainly local industrialists which gave them permission to generate electricity and operate hydroelectric generators at Chaudière Falls. Public transportation began in 1870 with a horsecar system, overtaken in the 1890s by a vast electric streetcar system that lasted until 1959.