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ISBN978-1-84728-643-7. Notes on track - Construction and Maintenance (Second Edition, Revised ed.). {displaystyle r={frac {L^{2}}{8v}} {frac {v}{2}}.} . Retrieved 22 November 2012. r ≈ L 2 8 v {displaystyle rapprox {frac {L^{2}}{8v}}} . Half chords, i.e. p.160. O C = O A 2 − A C 2 {displaystyle OC={sqrt {OA^{2}-AC^{2}}}} .

^ :Camp, Walter Mason (1904). Ellis' British railway engineering encyclopaedia: being a compendious reference of specialist engineering terms in common use upon the Railways of Britain. ^ Iwnicki, Simon (2006). ^ "Rail Software". Retrieved 22 November 2012. Then the rearrange formula to:. However, due to the complexity of the calculations over long lengths of track, it is now often done by computer,[5] with the track geometry data being loaded straight onto a computer controlled tamping and lining machine for implementation.

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