The mishap took place around 5.45 am when the driver of the vehicle lost control and dashed it into a pillar at Eastern Freeway on the Maasant road near Cotton Green, a senior police official said.
The cabin of the trailer was completely smashed up and the fire brigade personnel were called to extricate those sitting inside.
Two of the trailers cleaners -- Vishal Rajbhar (19) and Laxmikant Yadav (25) were declared brought dead at the hospital, while the driver, Narendra Yadav, suffered minor injuries, he said.