[3] From 1913, Valley Heights became an important railway centre and most of the buildings that exist in the depot date from the opening and early period; the ten stall sector roundhouse, a 60' turntable and new offices and sidings were built in 1913, followed by a Station Master's residence and a night-officer's house in 1914.

The change to electric traction (46 class locomotives) was associated with the electrification of the Main Western line to Lithgow which was completed in late 1957.

Over the intervening years the role of the depot had expanded to include servicing, repair and overhaul of electric locomotives and also goods wagons.

In 1989 the depot was closed and was used to store and service track maintenance material until 1993 when the State Rail Authority (SRA) vacated the site.

[3] In 1994, the Blue Mountains Division of the New South Wales Rail Transport Museum established the Valley Heights Locomotive Depot Heritage Museum with the aim of preserving the depot to provide historical, educational and recreational facilities and opportunities for the benefit of the Blue Mountains community and visitor to the region.

[3] External: Constructed of face brick with corrugated metal gabled roof extending as an awning in the form of broken back to both platforms, the Valley Heights station building is an early phase type 11 initial island/side platform building in standard Federation free classical style design.

The interiors generally feature custom orb ceilings with ceiling roses, enclosed or adapted fireplaces, moulded picture rails and cornices to the general waiting room, decorative cast iron wall vents, later floor tiling or carpet finish, and timber bead style moulded cornices.

[3] External: A small square shaped brick shed featuring moulded and rendered string course detailing similar to the main station building.

With the exception of original steel structure and trussed stair stringers (balustrade), it appears that all components of the bridge have been replaced during the 1992 upgrading works.

Above the iron on the rear walls are Oregon timber window frames, in a multi light awning style (hopper) operated on Austral stays.

Sited to the rear of bay 1 of the Roundhouse as an annex, the rail line and track has been extended into the workshop allowing access to rolling stock for repair.

Like most of the 1960s lean to additions, the room is clad externally in corrugated sheeting and also features timber framed vertically proportioned and double hung hopper windows.

The area is currently used as a store; however the space was originally constructed as an external access from the rear of the roundhouse on the south side of the site.

It is constructed of an Oregon timber frame, supported by brick piers and with A gable roof clad in corrugated steel sheeting.

The main entry is via a projecting skillion roofed partially enclosed porch with original timber framed and glass panelled doors.

[3] The building is of 1970s red brick construction, with flat roof form, sited to the rear of the open storage yard behind the machine workshop and roundhouse.

[3] The ash disposal tunnel is a below-ground-level structure constructed between the running rails of the access and departure roads with two covered ground-level pits.

[3] There is high archaeological potential within the locomotive depot site due to the existence of remnant sidings, ash tunnels and trestles foundations.

Some cracks are evident on the eastern wall at the lock height have been observed – possibly result of incompatible cement mortar repairs.

Despite being vacant for a number of years prior to the current tenants, the RTM has subsequently undertaken a systematic program of restoration works over time.

The turntable, ash disposal tunnel and pits, locomotive watering facilities, trackwork, trestling foundations, and overhead catenary masts are all in moderate condition.

[3] The locomotive depot site maintains a reasonable level of integrity in terms of the composition and layout of its buildings and structures, though some changes have taken place.

Even though its original purpose (the servicing of steam locomotives) has been altered to suit newer motive power, with a subsequent change to work methods and equipment, the integrity of the roundhouse has been retained.

The station has strong associations with the adjacent Locomotive Depot and is also evidence of development in Valley Heights maintaining its landmark quality within the non-urban townscape.

The collection of buildings and structures including the roundhouse, former chargeman's office, amenities building, turntable, ash disposal tunnel and pits, locomotive watering facilities, trackwork, trestling foundations and overhead catenary masts provide insight into the workings of an important transport and freight hub at the height of its operation.

The place also has a strong industrial aesthetic quality and is of technical and research significance providing valuable information about the age of steam.

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

The Valley Heights railway station is aesthetically significant as a good example of the Federation free classical style as used for public and institutional buildings.

[3] Valley Heights Locomotive Depot is aesthetically significant because of the original fabric and intact architectural features of the 1914 built roundhouse.

The locomotive site is of technical and research significance because the roundhouse and its equipment are the remnants of a past era, located in an area of the state where railways played so much a part in development and essential transport of goods and passengers.