Before resumption of the services, the required modalities and logistics to ensure smooth operation may be worked out in consultation with the state government, the letter, sent to the board on Friday, said.

West Bengal Chief Minister Mamata Banerjee had on Wednesday said her government is willing to allow one-fourth of suburban trains services and full Metro Railway services with adequate safety protocols, including social distancing from September 1.

The letter, however, did not suggest any date from which metro and local train services can be resumed.