"Upon receiving a tipoff that girls from Ranchi were being taken to Delhi to work as labourers, a GRP team began searching the Ranchi Sampark Kranti Express the moment it entered the station yesterday and found them," GRP DSP Surendra Tiwari said.
Five youths and one woman have been arrested in connection with the case, Tiwari said.
The arrested persons said that other girls were on the train who, too, were being taken to Delhi for the same purpose as the ones rescued.
The girls have been handed over to NGO Child Line and their parents are being contacted, police said.