The fire-fighting team was making relentless efforts to douse the flames, he added.
"The fire is almost under control and we have contained it from all sides," the official said, adding that if everything went according to the plan, cooling operations would commence soon.
The fire broke out at around 4.20 pm when municipal officials were carrying out an anti-encroachment drive outside the busy station.
No casualties had been reported among the residents of the area, while a fire brigade personnel was injured, the official said.
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The blaze forced the Western Railway to stop the Harbour Line services between Wadala and Andheri, in both directions, between 4.25 pm and 4.50 pm. The services were resumed subsequently.
The flames also touched the windows of the booking office at the south side foot overbridge (FOB) of the station.
The hawkers and slum-dwellers bore most of the brunt, losing their belongings to the fire.
"Some furniture and windows of the booking office at the south side FOB at the Bandra station got damaged due to the fire from the nearby slums...No casualty to railway staffers or passengers was reported," a statement from the Western Railway said.