Three people sitting on tracks were run over by a train near Nangloi Railway Station on Monday, railways said.
The three, who were believed to be drunk, were sitting on the tracks at 7.15 am when the Bikaner-Delhi Express mowed them down.
The train driver sounded the siren but the trio did not vacate the tracks, local police said.
The incident comes days after 59 people were run over by a train while watching Dusshera celebrations on railway tracks near Amritsar.