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Compared to the era without high-speed rail(HSR)services,HSR network development has significantly improved inter-city accessibility in megaregions.However,what is contentious is whether the major infrastructural network investment has created an uneven landscape of winners and losers.Using a door-to-door approach to integrate inter-and intra-city travel times,this paper simulates the changes in regional territorial and population accessibility,spatial equity,as well as associated winner and loser cities resulting from HSR network development in the Yangtze River Delta,China.