With an increased demand for the construction of new rail networks and upgrading the existing lines to handle larger traffic volumes, technical complexities have surged for the professionals engaged in design and construction roles. While reliable estimates are necessary for evaluating various design alternatives, it is equally or more important for contractors and other agencies involved to get the railway track cross-section drawings and actual materials used during construction. Road Estimator is proving to be a very effective tool for this purpose. Design changes or field-level data can easily be incorporated and processed for quick estimation and calculations.
In normal cases, the railway track cross-section is laid on ballast at formation level over a blanket layer which rests on the embankment. A strengthening layer of any cohesive material is provided on the side slopes of the embankment. Between the blanket and embankment, there can be an embankment subgrade that would be of a defined thickness and follows the required cross slope.
At places where the formation level is very high because of design requirements that result in a very high embankment. The high embankment is achieved at the site by providing side slope berms of specific widths at regular depth intervals, say around 3 to 6 m. When strengthening layer/layers are provided, those should follow the side slopes with berms.
Railroad yards are normally built where there is a need to store cars while they are not being loaded or unloaded or are waiting to be assembled into trains. Large yards may have a tower to control operations. At places like yard areas, sleepers are laid over layers of different materials like WBM, stone soling, and subgrade that can be over or below the existing ground.
In case of doubling, the centre line of the proposed track will be outside the construction area. Hence there can be challenges in relating the exact location of the cross-section with reference to the existing track’s centre line. Moreover, the offset distance between the centre line and the new line could change chainage to chainage.
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