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British annexation of the Punjab in 1848<unk>49. A considerable number were carted away as track ballast for the railway lines being laid in the Punjab.<unk> A considerable number were carted away as track ballast for the railway lines being laid in the Punjab. Most of the railway track between Multan and Lahore, laid in the mid-1850s, was supported by Harappan bricks.<unk> Most of the railway track between Multan and Lahore, laid in the mid-1850s, was supported by Harappan bricks.