The Thirroul station precinct includes the station buildings on Platform 1 and 2/3 (completed 1887 with 1915 alterations), the Railway Institute building (completed 1921 with 1937 alterations), the former toilet block (1915), two platforms (1887 with 1915 alterations), and modern steps, lifts, platform canopies and a footbridge (2005). The heritage listing includes the signals to the south of railway institute building. Thirroul Railway Station is located between Station Street (on the east) and Railway Parade (to the west), and is entered on the west through a park between the station and Lawrence Hargrave Drive, and from Station Street on the east via a modern covered footbridge with lifts and
stairs. There are station car parks on the western side of Station Street, and on the eastern side of Railway Parade. The station has a perimeter platform on its western side and an island platform to the east. The station's perimeters are defined with white powder-coated aluminium fencing. Platform 1 is the western perimeter platform. Platform 2/3 is the eastern island platform. ;Platform 1 Building (1887, 1915) A
weatherboard building with a cantilevered skillion platform
awning with curved steel
brackets on bolted steel posts. The awning has timber valances to both north and south ends. The building has a complex gabled corrugated steel roof, with
gable ends to north and south, and projecting
bay with gable end located towards the north end of the building on the street side (west elevation) only. Gable ends feature rectangular timber
louvred vents, simple timber bargeboards and
finials. There are two brick
chimneys. The awning extends for a bay beyond the north end of the building to allow cover to the ticket window which is located at the end of the building, with a separate
skillion roof. The building has modern timber panelled doors with 9-paned
fanlights above. The waiting area at the north end of the building has 2 pairs of modern timber panelled double doors, one facing the platform, and the other facing north, beneath a cantilevered awning with steel brackets and a corrugated steel skillion roof. The double doors have 12-paned fanlights (2 lines of 6 panes). The platform building contains waiting rooms, offices for the Station Master, parcels office and toilets and ladies waiting room. The waiting area at the north end of the building has been modernised. This has 2 pairs of modern timber panelled double doors, one facing the platform, and the other facing north, beneath a cantilevered awning with steel brackets and a corrugated steel skillion roof. ;Platform 2/3 Building (1887, 1915) A single storey weatherboard platform building with a gabled corrugated steel roof and cantilevered skillion roofed
awnings on both sides. There are no chimneys to the roof. The awnings have curved steel brackets mounted on steel posts and timber valances to both north and south ends. The building features timber framed double hung windows. Note: This building is thought to be the original station building, however, extended and lateres in 1915 for duplication works with new platform awnings, and latered again in 1938 for changes to the island platform. The platform building contains waiting rooms, offices for the Station Master, parcels office and toilets and ladies waiting room. ;Thirroul Railway Institute Building (1921, 1937) This is a single storey weatherboard and fibro freestanding building with a gabled corrugated steel roof, located at the south end of Platform 1. The building has a gabled entry
porch on its northern elevation supported on timber posts on short concrete posts. The concrete posts are capped with concrete made to resemble
sandstone. On its southern elevation, the building has a skillion roofed
veranda the full width of the elevation, supported on timber posts on short concrete posts with caps made to resemble sandstone. The building's walls are timber up to window sill level with fibro above. The building features timber framed double hung windows with 9-paned top
sashes. The gable ends to north and south elevations are timber shingled to the apex with pairs of small decorative timber brackets below the line of shingles, and timber battened fibro below. There are timber panelled double entry doors to the main entry on the north elevation. On the south elevation, in the southeast corner beneath the veranda roof, there is an addition with walls of vertical timber boards. ;Former toilets (1915) To the north of the railway institute is a small freestanding weatherboard gable-roofed former toilet building with a timber infilled gabled veranda facing south. There is a timber-framed window opening on the east side with frosted glass to the lower part and glass louvres to the upper part. There are rectangular timber vents to north and south gable ends. Note: this building may also have been relocated from Scarborough in 1915. ;Platforms (1887, 1915) 1 perimeter platform, 1 island platform – both with brick edges with concrete capping, asphalt surfaces ;Footbridge, steps, lifts (2005) Covered footbridge, steps and lifts towards the northern end of the station. ;Platform canopies (2005) On both Platforms 1 and 2/3 to the north of the platform buildings, modern canopies on steel posts with concrete bases and corrugated Colorbond roofs connect the platform buildings to the footbridge, steps and lifts towards the northern end of the platforms. ;Landscape and natural features Views of the Illawarra escarpment are available from the platforms at Thirroul Railway Station. ;Moveable items Signals located south of the railway institute building. Contents of Railway Institute building. ;Condition The platform buildings, Railway Institute building, former toilet block, moveable items and platforms were reported to be in good condition as at 29 July 2009. Both platform buildings were extensively altered in 1915, and interiors modernised recently. The extant railway station structures are externally intact as a group developed from 1887 to 1937.
Modifications and dates • 1912: Crossing loop added • 1915: Former Scarborough platform building relocated to Thirroul Platform 1 with new awning and chimneys. Existing 1887 building on Platform 2/3 altered for line duplication, with new platform awnings and extension. • 1921: Railway institute building built • 1937: Railway institute building was extended. • 1939: Platform 2/3 building altered for changes to island platform • 1941: Extensive loco depot arrangements at Thirroul with oil store, ash truck, coal bunker, turntable, weighbridge and offices. • 1986: Line electrified. New platform canopy added to the entry end of Platform 2/3. • 1989: Platform 1 building extensively refurbished • 2005: Existing footbridge and stairs replaced, steel canopies provided linking the footbridge to the platform buildings. == Heritage listing ==