Prior to the 1870s, Philadelphia's public transportation system consisted of dozens of independently owned and operated horse drawn streetcar lines. In the 1880s and 1890s steps were taken toward electrification and unification, a goal finally achieved in 1902 with the founding of Philadelphia Rapid Transit Company (PRT). PRT constructed subway and elevated train lines, and managed public transportation until 1940, when the Philadelphia Transportation Company (PTC) was established, absorbing PRT and all of its functions.