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| Ten Tunnels Deviation | |
|---|---|
| Name | Ten Tunnels Deviation |
| Location | Blue Mountains (New South Wales), New South Wales |
| Line | Main Western railway line |
| Opened | 1910 |
| Owner | Transport for NSW |
Ten Tunnels Deviation is a railway realignment on the Main Western line in the Blue Mountains (New South Wales), built to replace steep grades and tight curves on the original 1860s alignment near Lithgow and Glenbrook. The project, completed in 1910, is associated with major figures in Australian civil engineering and with institutions such as the New South Wales Government Railways and later State Rail Authority. It remains a key section connecting Sydney with Bathurst and inland New South Wales freight and passenger services.
Planning for the deviation arose from mounting concerns about the capacity limits of the 19th-century alignment originally engineered by John Whitton and constructed during the administration of the New South Wales Legislative Council and early New South Wales Government Railways. Proposals in the late 19th century involved engineers and politicians from New South Wales and consultations with international firms familiar with projects near Gotthard Tunnel and Rhone Valley. Construction began under the supervision of the New South Wales Minister for Works and was completed during the premiership of Charles Wade, reflecting broader state investment in infrastructure tied to the Federation of Australia era rail expansion. The deviation altered the operations of locomotives like NSWGR C38 class predecessors and influenced subsequent upgrades overseen by entities including Commonwealth Railways.
The alignment cuts through the Blue Mountains (New South Wales) escarpment between Lithgow and Lapstone, replacing the original zig-zag and steep-ruling approaches near Glenbrook. Engineers drew on techniques used on major tunnelling works such as the Seikan Tunnel and tunnel projects in Great Britain to design a series of tunnels and cuttings that reduced gradient and curvature for the Main Western line. The deviation incorporates portals and ventilation considerations similar to those seen on the Box Tunnel and adapts masonry arch principles used by contractors who had previously worked on projects connected to the New South Wales Railways Department and the London and North Western Railway.
Construction engaged private firms contracted by the New South Wales Government Railways; companies with experience in colonial-era rail work and stone masonry were employed, drawing labor from regional centers including Lithgow and Katoomba. The workforce included engineers trained under curricula influenced by institutions such as the University of Sydney and apprentices from workshops connected to the Australian Institute of Engineers. Funding and approval processes involved the New South Wales Treasury and parliamentary committees chaired by members of the New South Wales Legislative Assembly. Contractors utilized blasting techniques and ironwork supplied by foundries similar to those that supplied other Australian railway projects of the period, many linked commercially to firms trading with Port Jackson.
The deviation comprises a sequence of ten bored tunnels, each with named portals and masonry linings reflecting design trends of the early 20th century paralleled in works like the Simplon Tunnel and local railway architecture of the New South Wales Government Railways. Ancillary structures include retaining walls, culverts, and a notable sandstone cutting, echoing stonework traditions shared with buildings such as Parramatta Gaol and civic works in Newcastle. The portals and brickwork exhibit techniques also visible in major Australian rail sites associated with the era of engineers like John Whitton and administrators from the New South Wales Department of Public Works.
Since opening, the deviation has carried Intercity rail and regional freight services linking Sydney with inland cities including Bathurst and Dubbo. Operators have included the historic New South Wales Government Railways, later CountryLink and NSW TrainLink, and freight operators such as Australian National successors and private rail logistics firms. The improved gradient enabled heavier steam locomotives and later diesel locomotive classes to operate more efficiently, contributing to shifts in timetable planning and rolling stock deployment akin to changes seen on other mainlines such as the North Coast line, New South Wales.
The deviation traverses remnant bushland of the Blue Mountains (New South Wales) World Heritage region and has been discussed in the context of conservation debates involving agencies like the National Trust of Australia (NSW) and the New South Wales Heritage Council. Its construction and presence affected local communities including Lapstone and Glenbrook and features in regional histories compiled by organizations such as the Lithgow Library Service and local historical societies. The cuttings and tunnels have also been the subject of ecological surveys comparable to assessments around Jenolan Caves and heritage evaluations akin to those for the Katoomba Scenic Railway.
Maintenance responsibilities have passed through agencies including Transport for NSW and contractors retained under standards developed from practices used by the Australian Rail Track Corporation and heritage conservation guidelines promoted by the Australian Heritage Commission. Preservation work addresses sandstone deterioration, drainage, and structural timber or brickwork, engaging specialists akin to those who have worked on restorations at Central railway station, Sydney and masonry repairs at Fort Denison. Heritage listing processes and periodic engineering reviews ensure the deviation remains operational while balancing conservation priorities championed by bodies such as the Heritage Council of New South Wales.
Category:Rail transport in New South Wales Category:Railway tunnels in Australia