Sixteen fire tenders were pressed into service to control the blaze near Patipukur Railway tracks near Belgachhia.
Barrackpore Fire Brigade officials said the fire was now "under control".
Charred bodies of Priya Adikary, 16, and Nimai Adhikary, 16, were recovered from the spot.
The cause of the fire, which was first noticed at around 3 am, was yet to be ascertained, the officials said.
In a second incident of fire in north Kolkata, a garment manufacturing unit was badly damaged, fire brigade officials said.
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