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https://www.traveljunoon.com/tips-and-tricks/waiting-list-types-for-train-ticket-gnwl-rlwl-pqwl-tqwl-meaning/
GNWL, TQWL, RLWL, PQWL: क्या है भारतीय रेलवे के इन कोड्स का मतलब?