Prior to the Main Western line being quadrupled from Granville to Westmead in 1985, the station consisted of four platforms, platforms 3 and 4 on the main line and 1 and 2 on a loop.
In 1985, the station was refurbished with a new underground subway bus interchange built at the station’s north-east side.
In late 2003, work began on a new transport interchange which linked the station to the neighbouring Westfield Parramatta shopping centre. The works included upgrading the station, providing more access to commuters, and constructing a new bus interchange. On 19 February 2006 the interchange was opened.
More information: https://en.wikipedia.org/wiki/Parramatta_railway_station