In 1870, Hellman's cousin Isaiah M. Hellman was elected city treasurer while Isaias became a major investor in trolley lines, contributing funds in 1874 to start the Main Street and Agricultural Park Railway, which traveled from the Plaza, the heart of Los Angeles's downtown, to Agricultural Park, a horse-racing track. Hellman eventually invested in many of the city's rail lines and with Henry Huntington formed the Los Angeles Railway in 1898 and the Pacific Electric Railway in 1901.
