Rail transport, however, also played an essential role in supplying grain from food-surplus regions to famine-stricken ones. The 1880 Famine Codes urged a restructuring and massive expansion of railways, with an emphasis on intra-Indian lines as opposed to the existing port-centered system. These new lines extended the existing network to allow food to flow to famine-afflicted regions. Jean Drèze (1991) also finds that the necessary economic conditions were present for a national market in food to reduce scarcity by the end of the 19th century, but that export of food continued to result from that market even during times of relative scarcity. The effectiveness of this system, however, relied on government provision of famine relief: "Railroads could perform the crucial task of moving grain from one part of India to another, but they could not assure that hungry people would have the money to buy that grain".