It was the last service out of Sydney rostered to be hauled by steam locomotive, 3801 hauling the final service on 10 October 1969.[1] Its headcode was SL19/SL20.
For a time from June 1981 it was extended to Canberra.[2]
Until June 1970, it was formed of a dedicated set of R set carriages. It was then formed of N set carriages[3][4] before being replaced by air-conditioned HUB/RUB carriages released from the North Coast Overnight Express in late 1988.[5] In May 1990 it was again extended to Canberra, stopping at all stations south of Campbelltown.[6]
The Southern Highlands Express ceased running in the early 1990s.
The current morning service from Goulburn direct to Central and afternoon service from Central direct to Goulburn perform a similar function to the Southern Highlands Express, but are not named as such in the timetable.[7]