Many sections (esp with very heavy freight traffic) and regions not properly represented, has long been neglected and the traffic has gone so high that tripling is required before doubling is completed and quadrupling is required before tripling is completed. NGP-Wardha is not the first case
(1) Durg-BSP-JSG quadrupling sanctioned and tripling is still not completed
(2) BSP-Anuppur-Katni tripling sanctioned before doubling work is completed