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Amendment No. V-l/89 (Feb.)4.12.10 Lighting4.12.11 Escalators4.12.11.1 Provision of escalators4.12.11.2 Physical properties4.12.11.3 External applications4.12.11.4 Inspection and surveillance4.12.12 Finishes4.12.13 Waterproofing subway4.12.14 Pillar box4.13 FOUNDATIONS AND SUBSTRUCTURES4.13.1 General4.13.2 Specialist piling contractors4.13.3 Piling downdrag4.13.4 Caissons4.13.4.1 General4.13.4.2 Hand—dug caissons4.13.4.3 Machine—drilled caissons4.13.5 Railway bridge substructure4.13.6 Hydraulic effects4.13.6.1 Effects to be considered4.13.6.2 Pressure due to currents4.13.6.3 Scour4.13.6.4 Backwater effects4.13.6.5 Effects of waterborne traffic

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