[4] The contract for extending the railway from Lawson to Blackheath was awarded in 1863 to W. Watkins, who completed the track a year ahead of schedule in 1866, although the ballasting of the line by a separate contractor took longer.

Blackheath was to be the temporary terminus because of its level site and good water supply, but before the station was finished the destruction of the road bridge over the Nepean River at Emu Plains in the flood of 1867 prompted John Whitton, in charge of railways, to open the line as far as Wentworth Falls to assist stranded travellers to the west.

The Blackheath reconstruction, together with the restoration of Mortuary station, marked the start of heritage management in the NSW railway organisation.

[3] In October 2023, the station was upgraded, involving replacing the level crossing with lifts connecting the footbridge and platforms.

Detailing is generally restrained with rusticated weatherboard siding and V-jointed timber panelled gable ends.

Doors and windows are panelled with decorative architraves and sills, similar in design to rendered details on brick buildings from the period.

Original features include decorative moulded pressed metal ceiling to the general waiting room, double-hung sash windows with multi-paned upper sashes and coloured glazing, timber panelled doors with multi-paned fanlights, and chimney breasts.

This form is typical of Blue Mountains stations dictated by the topography and the deviation of the railway line.

Both have gabled roofs that assume a broken backed form above verandahs that span the footpath on the eastern sides of the buildings.

The external surface walls are of textured cement render and symmetrical facades are designed with central doors flanked by large display windows.

[3] The roof of the northern building is covered with fibro slates and features terracotta cresting and rams horn finials along the ridge.

The window at the southern end of the building is set into an arched opening and has a multi paned highlight over the main sash.

The building is significant for its contribution to the scenic qualities of the Blue Mountains railway landscape, forming part of a cohesive group of intact stations along the line.

Partial reconstruction of the building following a fire in 1985, together with the restoration of Mortuary station, marked the beginning of heritage management in the NSW railways.

[3] Blackheath railway station was listed on the New South Wales State Heritage Register on 2 April 1999 having satisfied a series of criteria marking its historical importance.

[3] This Wikipedia article contains material from Blackheath Railway Station Group, entry number 01088 in the New South Wales State Heritage Register published by the State of New South Wales (Department of Planning and Environment) 2018 under CC-BY 4.0 licence, accessed on 2 June 2018.