There were many different ways of spelling the name which translates to "the place or valley of the cabbage tree palms".

At the time of its relocation, the building's internal layout included a lavatory, ladies' room, general waiting room, and a combined booking, parcels and ticket office, with an awning at the end as well as on the platform side.

A separate timber building contained men's toilets (possibly also relocated from Scarborough).

[3] 1941 plans show extensive loco depot arrangements at Thirroul with an oil store, ash truck, coal bunker, turntable, weighbridge and offices.

[6] Dion's Bus Service operates two bus routes via Thirroul station, under contract to Transport for NSW: Premier Charters operates one bus route via Thirroul station, under contract to Transport for NSW: 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.

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.

[3] 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 features timber framed double hung windows with 9-paned top sashes.

On the south elevation, in the southeast corner beneath the veranda roof, there is an addition with walls of vertical timber boards.

[3] 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.

Thirroul Railway Station is of State historical significance as a railway station representing two separate periods of the construction of the Illawarra line – the initial 1887 construction and 1915 duplication of the line – and for its role as a transport hub for Thirroul since 1887.

[3] Thirroul railway station was listed on the New South Wales State Heritage Register on 2 April 1999 having satisfied the following criteria.

[3] The place is important in demonstrating the course, or pattern, of cultural or natural history in New South Wales.

Thirroul Railway Station is of historical significance as a railway station representing two separate periods of the construction of the Illawarra line – the initial 1887 construction and 1915 duplication of the line – and for its role as a transport hub for Thirroul since 1887.

The railway station buildings and structures show evidence of having developed over time since 1887.

[3] The place is important in demonstrating aesthetic characteristics and/or a high degree of creative or technical achievement in New South Wales.

The 1921 Railway Institute building, altered in 1937, is a rare example of this type of structure.

[3] The place possesses uncommon, rare or endangered aspects of the cultural or natural history of New South Wales.

[3] The place is important in demonstrating the principal characteristics of a class of cultural or natural places/environments in New South Wales.

[3] This Wikipedia article contains material from Thirroul Railway Station Group, entry number 01269 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.