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In page Rail transport modelling:
"Modern manufacturing techniques can allow mass-produced models to cost-effectively achieve a high degree of precision and realism.[citation needed] In the past this was not the case and scratch building was very common. Simple models are made using cardboard engineering techniques. More sophisticated models can be made using a combination of etched sheets of brass and low temperature castings. Parts that need machining, such as wheels and couplings are purchased.
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