Mumbai local trains play an important role in Vidya Balan and Emraan Hashmi-starrer "Ghanchakkar", so the makers have decided to promote the film in local trains.

A source close to the team revealed that the Mumbai local trains play a vital role in the film, so "when promotion strategies were being discussed, promotions on train was considered an important idea".

"Emraan and Vidya are set to promote the film on the local trains in four cities including Mumbai, Delhi, Indore and Lucknow, " added the source.

"Ghanchakkar" promos, released digitally, garnered positive response from the audience.

Directed by Rajkumar Gupta, the film is slated for a June 28 release.