The beginnings of the Mernda line was opened on 8 October 1889, as part of railway extensions into the northern suburbs. What became known as the Inner Circle line was opened from Spencer Street station (now Southern Cross station) via Royal Park station, to a station called Collingwood (now called Victoria Park), and then on to Heidelberg. The Epping line branched off at Fitzroy North to Preston Reservoir station (later renamed Reservoir) in 1889, with the line extended to Whittlesea a few months later, on 23 December.