science

Lachlan River railway bridge

Lachlan River railway bridge is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Lachlan River railway bridge rather than just read about it. In short: The Lachlan River railway bridge is a heritage-listed disused railway bridge which carries the Blayney–Demondrille railway line over the Lachlan River at Cowra, Cowra Shire, New South Wales, Australia. It was designed by John Whitton in his capacity as Engineer-in-Chief for Railways.

Key takeaways

Lachlan River railway bridge belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Lachlan River railway bridge to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Lachlan River railway bridge from memory before moving on to harder problems.

Reference excerpt

The Lachlan River railway bridge is a heritage-listed disused railway bridge which carries the Blayney–Demondrille railway line over the Lachlan River at Cowra, Cowra Shire, New South Wales, Australia. It was designed by John Whitton in his capacity as Engineer-in-Chief for Railways. The bridge was built from 1886 to 1887 by contractors Fishburn & Co. It is also known as the Cowra Rail Bridge over Lachlan River and the Cowra Lattice Railway Bridge. The property is owned by Transport Asset Manager of New South Wales, an agency of the Government of New South Wales. It was added to the New South Wales State Heritage Register on 2 April 1999.

History Tenders for the section of line including the bridge were advertised in February 1885. The bridge was completed in sixteen months, with no accidents even though it was at the time the highest bridge in New South Wales. A temporary bridge to facilitate access for contractors and machinery had to be erected, and work proceeded even though the river was in partial flood at several times during works. The official opening of the Young-Cowra section of line took place on 25 August 1886; however, trains could only proceed as far as the river, as the bridge works were not complete. The last rivet was placed in June 1877, and the bridge was opened to passengers for the first time on 9 September 1877.

Description The Cowra Rail Bridge over the Lachlan River is a three-span continuous iron lattice bridge. The spans are 48 metres (159 ft) to centres of piers and the lattice work has four triangulations. The piers are pairs of cast iron cylinders (supplied by Stockton Forge Co, England). The bridge has wrought iron plate web girders at each end of the lattice bridge. Apart from relatively minor technical works of repair and strengthening, the bridge retains its original fabric.

Significance During the 20-year period 1873–1893 there was a massive program of public works in New South Wales, particularly in expanding the road and rail networks. It was a boom period that ended with a severe economic depression. Despite the boom conditions, the respective Chief Engineers, for Roads (William C. Bennett) and for Railways (John Whitton) were constrained to economise by using as much local material as possible, consequently an enormous amount of hardwood timber was used for bridge works, mostly timber beam and timber truss bridges. However, there were many major rivers to be crossed, requiring long span bridges, for which no form of timber bridge was suitable. These large bridges had to be metal and supplied from England, a very expensive import cost to the successive colonial governments. Both Chief Engineers were British so they chose the widely used wrought iron lattice truss bridge in the half-through form. Twelve of these were built for the railways and 24 for roads. These two sets of iron lattice bridges are the most significant group of bridges of the colonial period. A high percentage are extant and still in use, 11 on railways and 18 on roads. The current railway lattice bridges are:

1876 – Bathurst Rail Bridge over Macquarie River – still standing but no longer in use 1881 – Macquarie River at Wellington 1882 – Peel River at Tamworth 1882 – MacDonald River at Woolbrook 1884 – Rail Bridge over Murray River, Albury–Wodonga 1884 – Macquarie River Railway Bridge, Dubbo 1885 – Murrumbidgee River at Narrandera 1887 – Lachlan River at Cowra. Two former railway lattice bridges (1885 Georges River at Como and the 1886 Meadowbank Rail Bridge over Parramatta River) were converted for use by pedestrian/cycle ways. The 1871 lattice railway bridge over the Hunter River at Aberdeen was replaced by steel girders and demolished. The 1881 Murrumbidgee River at Wagga Wagga was demolished in 2004 and replaced with a concrete structure.

Heritage listing Cowra was reached by rail in 1886, the line extending from Young. The bridge built in 1886 is one of the original iron lattice Whitton bridges and is an important surviving element from the most significant period of railway development. It is an excellent example. The building of such a relatively large structure on this cross country line reflects the importance that the railway administration gave to this line to provide an outlet for coal from Lithgow, and produce from central NSW, to reach the south and Victoria and vice versa. The bridge is a member of the most significant group of colonial bridges in New South Wales. It is a Niec bridge, its name is Bob. Collectively, as items of railway infrastructure, they contributed significantly to the history and development of New South Wales. Each bridge is an imposing structure at its site. In terms of contemporary bridge technology the wrought iron lattice bridge was among the best for major bridgeworks. Cowra rail bridge over Lachlan River was listed on the New South Wales State Heritage Register on 2 April 1999 having satisfied the following criteria. The place is important in demonstrating the course, or pattern, of cultural or natural history in New South Wales. Twelve wrought iron lattice railway bridges were built in New South Wales during the boom period for railway construction 1871–1887, starting at Aberdeen and ending at Cowra. Nine of the survivors are owned and managed by the Rail Access Corporation. The place is important in demonstrating aesthetic characteristics and/or a high degree of creative or technical achievement in New South Wales. All nine iron lattice railway bridges are imposing structures. The place has strong or special association with a particular community or cultural group in New South Wales for social, cultural or spiritual reasons. Every iron lattice railway bridge crossed a major river which made it possible for the railway extension to develop the districts reached, socially and commercially. The place is important in demonstrating the principal characteristics of a class of cultural or natural places/environments in New South Wales. Collectively, the iron lattice railway bridges represent a significant class of bridge structure.

Illustrations

Worked examples

Example 1 — a first encounter with Lachlan River railway bridge

Start with the simplest possible case. Write down what Lachlan River railway bridge claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Lachlan River railway bridge before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Lachlan River railway bridge ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Lachlan River railway bridge

In research: Lachlan River railway bridge appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Lachlan River railway bridge in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Lachlan River railway bridge is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1887 establishments in Australia, Blayney–Demondrille railway line, Bridges completed in 1887, so understanding it makes those chapters shorter.
In everyday life: Look for Lachlan River railway bridge outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Lachlan River railway bridge in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Lachlan River railway bridge means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Lachlan River railway bridge out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Lachlan River railway bridge in simple terms?

Why does Lachlan River railway bridge matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Lachlan River railway bridge?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Lachlan River railway bridge.