Vincent Francis Seyfried, The Long Island Rail Road: A Comprehensive History (1961)
“ To gratify a foolish vanity, the South Side RR was forced to assume a third mortgage of half a million dollars, the interest on which could only add to the burden of fixed charges on the road. Competition of other roads. From the opening of the road in October 1867 to June 1872 the South Side RR enjoyed the advantage of a monopoly of the traffic on the south side and to Rockaway. The first serious inroad into the South Side's prosperity was the opening of the Long Island Railroad's Rockaway Branch in June 1872. ”
